SUMMARY

The following is a summary that highlights information contained in this proxy statement/prospectus. This summary might not contain all of the information that may be important to you. For a more complete description of the Merger Agreement and the Merger, as well as the Plan, US Airways Group and AMR encourage you to read carefully this entire proxy statement/prospectus, including the attached annexes. In addition, each of US Airways Group and AMR encourage you to read the documents incorporated by reference by US Airways Group into this proxy statement/prospectus, which have been filed with the SEC. These documents include important business and financial information about US Airways Group. You may obtain the information of US Airways Group incorporated by reference into this proxy statement/prospectus and documents of AMR filed with the SEC without charge by following the instructions in the section entitled “Additional Information” beginning on page 336. For the convenience of the reader, certain capitalized terms used in this proxy statement/prospectus have been consolidated into a Glossary beginning on page 32.

The Companies

US Airways Group, Inc.

US Airways Group, Inc., a Delaware corporation, is a holding company whose primary business activity is the operation of a major network airline through its wholly-owned subsidiaries US Airways, Inc., Piedmont Airlines, Inc., PSA Airlines, Inc., Material Services Company, Inc., and Airways Assurance Limited. Material Services Company, Inc. and Airways Assurance Limited operate in support of US Airways Group’s other subsidiaries in areas such as the procurement of aviation fuel and insurance. US Airways Group was formed in 1982, and its origins trace back to the formation of All American Aviation in 1939. US Airways, Inc., a Delaware corporation, was formed in 1982. Effective upon US Airways Group’s emergence from bankruptcy on September 27, 2005, US Airways Group merged with America West Holdings Corporation (“America West”), with US Airways Group as the surviving corporation. US Airways Group operates more than 3,100 flights per day and serves 198 communities in the U.S., Canada, Mexico, Europe, the Middle East, the Caribbean, and Central and South America.

US Airways Group’s principal executive offices are located at 111 West Rio Salado Parkway, Tempe, Arizona 85281. US Airways Group’s telephone number is (480) 693-0800, and its Internet address is www.usairways.com. Information contained on its website is not and should not be deemed a part of this proxy statement/prospectus or any filing filed with or furnished to the SEC.

AMR Corporation

AMR Corporation, a Delaware corporation, was incorporated in October 1982. Virtually all of AMR’s operations fall within the airline industry. AMR’s principal subsidiary, American Airlines, Inc., was founded in 1934. At the end of 2012, American provided scheduled jet service to approximately 160 destinations throughout North America, the Caribbean, Latin America, Europe, and Asia.

AMR Eagle Holding Corporation, a wholly-owned subsidiary of AMR (“AMR Eagle”), owns a regional airline which does business as American Eagle^®. American also contracts with certain independently owned regional air carriers to provide it with regional feed under the American Eagle^® and American Connection^® names.

American, together with the regional airlines that provide regional feed to American—American Eagle, Chautauqua Airlines, Inc., SkyWest Airlines, Inc., Republic Airlines, Inc., and ExpressJet Airlines, Inc. (collectively, the “American Eagle Carriers”), American Eagle Carriers, serves more than 250 cities in approximately 50 countries with, on average, 3,400 daily flights. The combined network fleet numbers

approximately 900 aircraft. American is also a founding member of the oneworld^® alliance, which enables member airlines to offer their customers more services and benefits than any member airline can provide individually. These services include a broader route network, opportunities to earn and redeem frequent flyer miles across the combined oneworld^® network, and access to more airport lounges. Together, oneworld^® members serve more than 800 destinations in approximately 150 countries, with about 9,000 daily departures. American is also one of the largest scheduled air freight carriers in the world, providing a wide range of freight and mail services to shippers throughout its system onboard American’s passenger fleet.

AMR’s principal executive offices are located at 4333 Amon Carter Blvd., Fort Worth, Texas 76155. AMR’s telephone number is (817) 963-1234, and its Internet address is www.aa.com. Information contained on its website is not and should not be deemed a part of this proxy statement/prospectus or any filing filed with or furnished to the SEC.

AMR Merger Sub, Inc.

AMR Merger Sub, Inc., a Delaware corporation, is a wholly-owned subsidiary of AMR that was formed on February 11, 2013 for the sole purpose of effecting the Merger.

The Merger (see page 73)

Form of the Merger

Under the terms of the Merger Agreement, AMR Merger Sub, a wholly-owned subsidiary of AMR, will merge with and into US Airways Group, with US Airways Group surviving as a wholly-owned subsidiary of AMR. Immediately following the Closing, AMR will change its name to American Airlines Group Inc., which will be the name of the combined company following the Closing.

Merger Consideration and Plan Shares

As a consequence of the Merger, US Airways Group common stockholders will receive one share of common stock of AAG in exchange for each share of common stock of US Airways Group they hold. The value of the common stock of AAG that a US Airways Group common stockholder will receive in the Merger is not fixed and will depend upon the value of AAG common stock. Pursuant to the Plan, all outstanding equity securities of AMR at the time of the Merger will be cancelled. The shares of AAG common stock to be issued in connection with the Merger will be newly issued shares. Consequently, neither the trading price of US Airways Group common stock nor the trading price of AMR common stock reflect the price at which AAG common stock will trade following the Merger.

Pursuant to and in accordance with the Plan, all allowed prepetition general unsecured claims against the Debtors (other than intercompany claims), all equity interests in AMR, and all rights of labor groups of the Debtors to receive AAG common stock in connection with the Plan will be satisfied solely with Plan Shares, consisting of newly issued AAG common stock and AAG Convertible Preferred Stock. Holders of equity interests in AMR and labor-related claims will receive AAG common stock, and holders of allowed prepetition general unsecured claims against the Debtors will receive either AAG Convertible Preferred Stock or a combination of AAG Convertible Preferred Stock and AAG common stock, in each case, as set forth in the Plan. The aggregate number of shares of AAG common stock constituting Plan Shares, when taken together with all shares of AAG common stock that are or may become issuable upon conversion or exchange of shares of AAG Convertible Preferred Stock constituting Plan Shares, will not exceed a number of shares of AAG common stock equal to the aggregate number of shares of AAG common stock equal to (i)(a) the US Airways Fully Diluted Shares, multiplied by (b) the quotient (rounded to four decimals) of 72 divided by 28 (rounded to the nearest whole share) less (ii) the number of shares of AAG common stock represented by equity-based awards to be

issued to employees of AMR and its subsidiaries as contemplated by the Merger Agreement and the Plan, subject to certain agreed upon exceptions (the “Maximum Plan Shares”). As used herein, “US Airways Fully Diluted Shares” means the number of shares of US Airways Group common stock that would be deemed to be outstanding for purposes of calculating “diluted earnings per share” under U.S. generally accepted accounting principles (“GAAP”) using the treasury stock method, as modified by the Merger Agreement, including that the average market price used in such calculation will be equal to the average of the daily closing prices for US Airways Group common stock on the NYSE for each of the 20 trading days ending on (and including) the sixth trading day prior to the Closing.

The aggregate number of shares of AAG common stock issuable in the Merger to holders of US Airways Group equity instruments (including stockholders, holders of convertible notes, optionees, and holders of RSUs) will represent 28% of the diluted equity ownership of AAG. The remaining 72% diluted equity ownership in AAG will be distributable, pursuant to the Plan, to stakeholders, labor unions, and certain employees of AMR and the other Debtors and such 72% of the diluted equity ownership of AAG includes all shares of AAG common stock that are or may become issuable upon conversion of shares of AAG Convertible Preferred Stock. The aggregate number of shares of AAG common stock issuable under the Plan, whether directly or upon the conversion of AAG Convertible Preferred Stock, will not exceed 72% of the diluted equity ownership of AAG as of the time of the Merger. Accordingly, the 28% diluted equity ownership of AAG that will be distributed to the holders of US Airways Group equity instruments will not be diluted by the conversion of the AAG Convertible Preferred Stock or by the issuance of shares of AAG common stock pursuant to the Plan. The determination of the 28% diluted equity ownership of AAG that will be distributed to the holders of US Airways Group equity instruments takes into account the outstanding options, stock-settled RSUs, stock-settled SARs, the US Airways 7% Convertible Notes, and the US Airways 7.25% Convertible Notes, though it does not take into account future issuances of common stock following the Closing, which would be dilutive to all holders of AAG common stock.

Effectiveness of the Merger Agreement (see page 113)

On May 10, 2013, the Bankruptcy Court entered an order entitled Order Authorizing and Approving (i) Merger Agreement Among AMR Corporation, AMR Merger Sub, Inc., and US Airways Group, Inc., (ii) Debtors’ Execution of and Performance Under Merger Agreement, (iii) Certain Employee Compensation and Benefit Arrangements, (iv) Termination Fees, and (v) Related Relief (ECF No. 8096) (the “Merger Support Order”). In accordance with the Merger Agreement, upon entry of the Merger Support Order and execution of the Amendment, the Merger Agreement became effective and binding on, and enforceable against, each of the parties thereto retroactive to February 13, 2013. See the section entitled “The Merger Agreement—Effectiveness of the Merger Agreement” beginning on page 113 for a discussion of the Merger Support Order and the effectiveness of the Merger Agreement.

Termination of the Merger Agreement (see page 134)

AMR and US Airways Group may mutually agree to terminate the Merger Agreement at any time prior to the Effective Time. Either company may also terminate the Merger Agreement if the Merger is not completed by October 14, 2013, subject to extension by either party in the event that certain regulatory clearances have not yet been obtained; provided that in no event will such extension be to a date that is later than December 13, 2013, unless a party delays its response to a request for additional information (a “Second Request”) from the U.S. Department of Justice (the “DOJ”), in which case the other party may extend the deadline beyond December 13, 2013 by the number of days so delayed. Further, the parties’ rights to terminate the Merger Agreement if the Merger is not completed by October 14, 2013 are subject to extension by either party in the event that certain conditions related to the Plan have not been satisfied or waived; provided that in no event will such extension be to a date that is later than December 13, 2013. The parties may also terminate the Merger Agreement in certain additional circumstances. See the section entitled “The Merger Agreement—Termination of the Merger

Agreement” beginning on page 134 for a discussion of these and other rights of each of AMR and US Airways Group to terminate the Merger Agreement.

The Combined Company after the Merger (see page 146)

American Airlines Group Inc.

Following the Closing, AMR will change its name to American Airlines Group Inc., or AAG, and will operate its airlines under the American Airlines^® brand, principally through its mainline operating subsidiaries, American and US Airways. AAG is expected to integrate American and US Airways into a single airline, under a single FAA operating certificate, within two years following the Closing, subject to receipt of FAA approval. Following the Closing, US Airways will withdraw from the Star Alliance and join the oneworld^® alliance. After giving effect to the Merger, AAG is expected to offer more than 6,700 daily flights to 336 destinations in 56 countries around the world. AMR and US Airways Group expect that AAG will maintain all nine hubs currently served by American and US Airways, resulting in a significantly larger network and more travel options for customers. AMR and US Airways Group also expect that the American Eagle Carriers and the US Airways Group regional carriers will continue to operate as distinct entities, providing seamless service to customers of AAG. AAG will be headquartered in Dallas-Fort Worth and will maintain a significant corporate and operational presence in the Phoenix metropolitan area. AMR and US Airways Group expect AAG to employ approximately 100,000 people around the world. AAG will also provide customers with more choices and increased service across a larger worldwide network, including an enhanced oneworld^® alliance, than either American or US Airways could offer independently. Upon integration of the American and US Airways frequent flyer programs, AMR and US Airways Group expect that AMR’s AAdvantage^® frequent flyer program (the “AAdvantage^® program”) will become the industry’s leading frequent flyer loyalty program based on AMR’s and US Airways Group’s anticipation that the AAdvantage^® program will have the world’s largest passenger network, the most available award destinations, and largest number of participants.

Expansive Global Network

AAG is expected to create a competitive alternative to Delta Air Lines and United Airlines by offering a comprehensive domestic flight network as well as a world-class global flight network that will have the scale, breadth, and capabilities to compete with the world’s largest airlines. AAG will combine the flight networks of AMR and US Airways Group, which are highly complementary with few route overlaps. Out of the more than 680 domestic nonstop routes that American and US Airways fly, only 12 nonstop flights overlap. Systemwide, American serves 130 cities not served by US Airways, and US Airways serves 62 cities not served by American. By combining these complementary flight networks, AAG expects to fill gaps in the flight networks provided by each airline individually, improve traffic flows through the existing hubs of American and US Airways, and expand service from those hubs to offer increased connectivity to existing markets and service to new cities. The combination of the two networks will enhance connectivity within the oneworld^® alliance—including joint businesses with British Airways and Iberia across the Atlantic, to which Finnair is expected to be added, and with Japan Airlines and Qantas across the Pacific—by creating more options for travel and benefits both domestically and internationally, with connecting service to 83 destinations in Latin America and the Caribbean, 21destinations in Europe and the Middle East, and five destinations in Asia.

Revitalized Fleet

Including aircraft delivered or scheduled to be delivered to AMR and US Airways Group in 2013, AAG is scheduled to take delivery of more than 600 new aircraft through 2022, including 517 narrowbody aircraft and 90 widebody international aircraft. AAG’s fleet is expected to feature fully lie-flat, all-aisle access premium seating on American’s new Boeing 777-300ER aircraft—similar to US Airways’ Airbus A330 international Envoy service. AAG will also retrofit some of its widebody fleet to include fully lie-flat premium seating in an effort to

provide a consistent experience for customers. AMR and US Airways Group expect AAG to have one of the most modern and efficient fleets in the industry with features that will be particularly appealing to business customers.

Expected Synergies

In considering the Merger, management of AMR and US Airways Group analyzed the potential cost and revenue synergies that could be generated by combining the companies, taking into account the benefits already achieved by AMR’s restructuring. AMR and US Airways Group management have estimated that AAG will achieve more than $1 billion in annual net synergies in 2015, including cost synergies of approximately $150 million (after taking into account the improved compensation arrangements negotiated with employees of AAG) and revenue synergies of approximately $900 million (the “Expected Synergies”). AMR and US Airways Group expect to realize the cost synergies principally by reducing management and administrative overhead, consolidating information technology systems, and combining facilities. AMR and US Airways Group expect to realize the revenue synergies principally from providing significantly enhanced connectivity throughout the world to permit customers, particularly corporate clients, to use AAG for more of their travel needs and from optimizing the scheduling of the combined fleet to better match aircraft size with consumer demand. AMR and US Airways Group also expect to incur transition costs in connection with the Merger and the integration of the businesses of AMR and US Airways Group of approximately $1.2 billion. There can be no assurance that AAG will be able to achieve these cost and revenue synergies at all, or that, if achieved, they can be achieved in a timely manner. In addition to the transition costs expected to be incurred in connection with the Merger, AMR will pay approximately $1.4 billion in cash at emergence to settle certain obligations in connection with the Plan.

Board of Directors and Management of AAG after the Merger

Following the Merger, the board of directors of AAG will consist of 12 members. Five of these directors will be designated by the Search Committee appointed by the UCC and a majority of the Consenting Creditors (and one of such directors will be the lead Independent Director); two of these directors will be designated by AMR and must be reasonably acceptable to the Search Committee; three of these directors will be designated by US Airways Group; and the two remaining directors will be Mr. Horton, the current chairman and chief executive officer of AMR, who will also serve as chairman of the board of directors of AAG, and Mr. Parker, the current chairman and chief executive officer of US Airways Group, who will also serve as chief executive officer of AAG. As of the date of this proxy statement/prospectus, the other members of the board of directors of AAG have not been identified.

Mr. Horton will serve as chairman of the board of AAG until the earliest of:

Following the earliest of such dates, Mr. Parker will serve as chairman of the board of directors of AAG until the election of a new chairman by the affirmative vote of the board of directors of AAG, which, prior to the date that is the 18 month anniversary of the Closing Date, will require the affirmative vote of at least 75% of the members of the board of directors of AAG (rounded up to the next full director), which must include at least one director who was designated as a director by US Airways Group pursuant to the Merger Agreement.

Mr. Parker will designate the additional officers of AAG, subject to the approval of the board of directors of AAG, and Mr. Parker will consult with Mr. Horton in connection with such selections. US Airways Group stockholders are urged to read the discussion in the section entitled “The Combined Company after the Merger” beginning on page 146.

Recommendation of US Airways Group’s Board of Directors (see page 71)

The US Airways Group board of directors believes that the Merger Agreement and the Merger are advisable and in the best interests of US Airways Group and its stockholders and has unanimously approved the Merger Agreement and the Merger, and unanimously recommends that US Airways Group stockholders vote “FOR” adoption of the Merger Agreement and “FOR” the adoption of each of the other proposals described in this proxy statement/prospectus.

US Airways Group Stockholders Entitled to Vote (see page 65)

US Airways Group stockholders of record at the close of business on                     , 2013, or the Record Date, are entitled to receive notice of and to vote at the 2013 Annual Meeting of Stockholders and at any adjournments or postponement thereof. On the Record Date, there were             shares of US Airways Group’s common stock outstanding and eligible to be voted at the 2013 Annual Meeting of Stockholders. Each share of US Airways Group’s common stock entitles its record holder to one vote on each matter submitted to the stockholders.

Vote Required

Assuming a quorum is present, the vote requirements for the various proposals are as follows:

Voting by US Airways Group Directors and Executive Officers (see page 71)

As of the Record Date, directors and executive officers of US Airways Group were entitled to vote approximately             shares of US Airways Group common stock or approximately     % of the shares of US Airways Group common stock outstanding on that date. The affirmative vote of a majority of the outstanding shares of US Airways Group common stock that are entitled to vote at the 2013 Annual Meeting of Stockholders is required to adopt the Merger Agreement. Each director and executive officer has indicated his or her present intention to vote, or cause to be voted, the shares of US Airways Group common stock owned by him or her “FOR” the adoption of the Merger Agreement.

Opinion of US Airways Group’s Financial Adviser (see page 90)

On February 13, 2013, Barclays Capital Inc. (“Barclays”) rendered its opinion to US Airways Group’s board of directors that, as of such date and based upon and subject to the qualifications, limitations, and assumptions stated in its opinion, from a financial point of view, the consideration to be received by the stockholders of US Airways Group in the Merger is fair to the stockholders of US Airways Group.

The full text of Barclays’ written opinion, dated as of February 13, 2013, is attached as Annex E to this proxy statement/prospectus. Barclays’ written opinion sets forth, among other things, the assumptions made, procedures followed, factors considered, and limitations upon the review undertaken by Barclays in rendering its opinion. You are encouraged to read the opinion carefully in its entirety. Barclays’ opinion is (i) addressed to the board of directors of US Airways Group, (ii) addresses only the fairness, from a financial point of view, of the consideration to be offered to the stockholders of US Airways Group, and (iii) does not constitute a recommendation to any stockholder of US Airways Group as to how such stockholder should vote with respect to the proposed transaction or any other matter. Barclays was not requested to address, and its opinion does not in any manner address, US Airways Group’s underlying business decision to proceed with or effect the proposed transaction.

Interests of US Airways Group’s Directors and Executive Officers in the Merger (see page 107)

Certain members of the board of directors and executive officers of US Airways Group have interests in the Merger that are different from, or are in addition to, the interests of US Airways Group stockholders generally. These interests include those discussed below.

US Airways Group’s executive officers are parties to agreements with US Airways Group and US Airways that provide for certain benefits upon a change in control of US Airways Group, including the Merger, and for severance benefits if their employment is terminated under certain circumstances in connection with a change in control of US Airways Group, including the Merger. In addition, the Merger Agreement provides that, as of the Effective Time, AAG will provide certain current and former US Airways Group non-employee directors various flight privileges and, in certain cases, a related tax gross-up payment.

Furthermore, US Airways Group compensation and benefit plans and arrangements provide for accelerated vesting of certain equity awards held by US Airways Group executive officers and directors upon the closing of a change in control of US Airways Group, including the Merger. Each US Airways Group executive officer has agreed to waive his or her rights to accelerated vesting of US Airways Group stock options, US Airways Group RSUs, and/or US Airways Group SARs, in each case, solely as a result of the Closing. In lieu of such rights, the US Airways Group executive officers have been provided a right to “double trigger” accelerated vesting of such equity awards, meaning the vesting of such equity awards would instead accelerate only upon a qualifying termination of such executive officers in connection with the Closing.

For more information, see the section entitled “The Merger—Interests of US Airways Group’s Directors and Executive Officers in the Merger” beginning on page 107.

Treatment of US Airways Group Equity Awards (see page 110)

The Merger Agreement provides that, at the Effective Time, (i) each US Airways Group stock option that is outstanding immediately prior to the Effective Time, whether or not vested, will be converted into an option to purchase a number of shares of AAG common stock equal to the number of shares of US Airways Group common stock underlying the applicable US Airways Group stock option, and AAG will assume such stock option, (ii)(a) each US Airways Group stock-settled SAR that is outstanding immediately prior to the Effective Time, whether or not vested, will be converted into a stock-settled SAR covering a number of shares of AAG common stock equal to the number of shares of US Airways Group common stock underlying the applicable US

Airways Group stock-settled SAR, and (b) each US Airways Group cash-settled SAR that is outstanding immediately prior to the Effective Time will be converted into a cash-settled SAR to acquire an amount of cash determined by reference to a number of shares of AAG common stock equal to the number of shares of US Airways Group common stock referenced by the applicable US Airways Group cash-settled SAR and, in each case, AAG will assume such SAR, and (iii)(a) each US Airways Group stock-settled RSU, each of which represents the right to receive one share of US Airways Group common stock, that is outstanding immediately prior to the Effective Time will be converted into a stock-settled RSU with respect to one share of AAG common stock, and (b) each US Airways Group cash-settled RSU, each of which represents the right to receive the value of one share of US Airways Group common stock, that is outstanding immediately prior to the Effective Time will be converted into the right to receive an amount in cash based on the value of one share of AAG common stock and, in each case, AAG will assume such RSU.

For more information, see the sections entitled “The Merger Agreement—The Merger Consideration and the Plan Shares—US Airways Group Stock Options and Other Stock Awards” beginning on page 116 and “The Merger Agreement—The Merger Consideration and the Plan Shares—US Airways Stock Options and Other Stock Awards—US Airways Group Restricted Stock Units” beginning on page 117.

Listing of AAG Common Stock and Delisting of US Airways Group Common Stock (see page 106)

It is a condition to Closing that the shares of AAG common stock to be issued to US Airways Group equity holders pursuant to the Merger Agreement be authorized for listing on the NYSE or NASDAQ prior to the Effective Time. AMR will use its reasonable best efforts to cause the shares of AAG common stock to be authorized for listing on the NYSE or NASDAQ upon official notice of issuance, prior to the Closing Date. Upon the Closing, shares of US Airways Group common stock currently listed on the NYSE will be delisted and will be deregistered under the Exchange Act.

No Dissenters’ Rights (see page 106)

Under the DGCL, holders of US Airways Group common stock are not entitled to appraisal rights in connection with the Merger.

Comparison of Stockholder Rights and Corporate Governance Matters (see page 173)

US Airways Group stockholders receiving shares of AAG common stock in connection with the Merger will have different rights once they become stockholders of AAG due to differences between the governing corporate documents of US Airways Group and the proposed governing corporate documents of AAG. These differences are described in detail in the sections entitled “Description of Capital Stock of AAG” beginning on page 170 and “Comparison of Stockholder Rights and Corporate Governance Matters” beginning on page 173.

The Plan of Reorganization (see page 149)

On April 15, 2013, AMR and the other Debtors filed the Plan and the Disclosure Statement with the Bankruptcy Court. The Plan incorporates and will implement the Merger pursuant to the Merger Agreement. In addition, the Plan contains provisions for the treatment of equity interests in and prepetition claims against AMR and the other Debtors. Upon the effectiveness of the Plan and the Merger, which are anticipated to occur substantially contemporaneously, all shares of existing AMR common stock and other equity interests in AMR will be cancelled and all rights with respect thereto will cease to exist. For more information, see the section entitled “The Plan of Reorganization” beginning on page 149.

Regulatory Approvals Required for the Merger (see page 102)

Several domestic and international regulatory filings and approvals are required before AMR and US Airways Group can effect the Closing. Under the Hart-Scott Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), AMR and US Airways Group were required to file notifications with the Premerger Notification Office of the U.S. Federal Trade Commission (“FTC”) and the Antitrust Division of the DOJ and to observe a mandatory waiting period before completing the Merger. On March 4, 2013, AMR and US Airways Group received a Second Request from the DOJ in connection with the proposed Merger. The issuance of the Second Request extended the statutory HSR Act waiting period during which the parties cannot close the Merger. The DOJ is currently conducting its review of the Merger. Several state attorneys general also are reviewing the Merger and are coordinating their investigation with the DOJ. In addition, the Merger is subject to the pre-Closing approval of the European Commission under European Union (“EU”) merger control legislation. AMR and US Airways Group have also notified the Merger to the competition authorities in Canada, Brazil, and Mexico. These competition authorities have now all completed their review of the Merger without taking further action. The parties do not expect to file merger notifications in jurisdictions other than those described above. In addition to the antitrust related filings and clearances discussed above, AMR and US Airways Group must obtain approvals from various other U.S. regulatory agencies, including any required approvals from the U.S. Department of Transportation (“DOT”) and the U.S. Federal Aviation Administration (“FAA”), as well as certain other foreign regulatory authorities in connection with the Merger. However, obtaining such approvals (other than any required approvals from the DOT or the FAA) is only a condition to the Closing if the failure to obtain such approvals would reasonably be expected to result in a material adverse effect on AMR, US Airways Group, or AAG or to provide a reasonable basis to conclude that AMR, US Airways Group, or any of their respective directors or officers would be subject to the risk of criminal liability. AMR and US Airways Group do not believe that the failure to receive any such regulatory approvals, other than any required approvals from the DOT or the FAA, would reasonably be expected to result in a material adverse effect on AMR, US Airways Group, or AAG, or provide a reasonable basis to conclude that AMR, US Airways Group, or any of their respective directors or officers would be subject to the risk of criminal liability.

Conditions to the Merger (see page 131)

Conditions to Each Party’s Obligations to Effect the Merger

AMR’s, AMR Merger Sub’s, and US Airways Group’s obligations to complete the Merger are conditioned upon the satisfaction or waiver of each of the following conditions:

Conditions to Obligations of AMR and AMR Merger Sub

AMR’s and AMR Merger Sub’s obligations to effect the Merger are subject to the satisfaction or waiver of the following conditions:

Conditions to Obligations of US Airways Group

US Airways Group’s obligation to effect the Merger is also subject to the satisfaction or waiver of the following conditions:

Expected Timing of the Merger

AMR and US Airways Group plan to complete the Merger as soon as is reasonably practicable and presently expect the Closing to occur in the third quarter of 2013. However, AMR and US Airways Group cannot predict the exact timing of the Closing because it is subject to approval of the Bankruptcy Court as part of the Plan, regulatory approvals, and other conditions.

Non-Solicitation of Acquisition Proposals (see page 124)

The Merger Agreement restricts US Airways Group and AMR from initiating, soliciting, knowingly encouraging, or facilitating certain proposals or offers with respect to a competing acquisition proposal, including the acquisition of a significant equity interest in US Airways Group or AMR (including AMR as reorganized pursuant to the Bankruptcy Code) or the acquisition of a significant portion of the assets of US Airways Group or AMR, or, in the case of AMR, the acquisition of claims against AMR that would entitle the purchaser to a significant equity interest in AMR (as reorganized pursuant to the Bankruptcy Code) or any plan of reorganization of AMR other than the Plan. However, each of US Airways Group or AMR may consider competing, unsolicited acquisition proposals and enter into discussions or negotiations regarding such acquisition proposals, if its board of directors determines that any such acquisition proposal constitutes, or is reasonably likely to lead to, a superior proposal and that the failure to take such action is reasonably likely to be inconsistent with its fiduciary duties under applicable law.

Termination Fees and Expenses (see page 136)

Subject to the specific exceptions discussed in this proxy statement/prospectus, in the event the Merger Agreement is terminated, US Airways Group may be required to pay a termination fee of $55 million or $195 million and AMR may be required to pay a termination fee of $135 million or $195 million (as the case may be). See the section entitled “The Merger Agreement—Termination Fees and Expenses” beginning on page 136 for a discussion of the circumstances under which such termination fees will be required to be paid.

Material U.S. Federal Income Tax Consequences of the Merger (see page 103)

The Merger in conjunction with the Plan is intended to qualify as a reorganization within the meaning of Section 368(a) of the Code, and the Closing is conditioned upon the receipt by each of US Airways Group and AMR of an opinion from its outside counsel to the effect that the Merger so qualifies. If the Merger in conjunction with the Plan qualifies as such a reorganization, U.S. Holders generally will not recognize gain or loss as a result of the exchange of US Airways Group common stock for AAG common stock in the Merger, their aggregate tax basis in AAG common stock received in the Merger will be equal to the aggregate tax basis of the US Airways Group common stock surrendered in the Merger, and their holding period for AAG common stock received in the Merger will include their holding period for the US Airways Group common stock surrendered in the Merger. U.S. Holders who hold their US Airways Group common stock with differing bases or holding periods should consult their tax advisers with regard to identifying the bases or holding periods of the particular AAG common shares received in the Merger. As used herein, a “U.S. Holder” means a beneficial owner of US Airways Group common stock who is, for U.S. federal income tax purposes: (i) an individual who is a citizen or resident of the United States; (ii) a corporation (or other entity taxable as a corporation for U.S. federal income tax purposes) created or organized under the laws of the United States, any state thereof, or the District of Columbia; (iii) an estate, the income of which is subject to U.S. federal income tax regardless of its source; or (iv) a trust that (a) is subject to the primary supervision of a U.S. court and the control of one or more U.S.

persons (within the meaning of Section 7701(a)(30) of the Code), or (b) has made a valid election under applicable U.S. Treasury regulations to be treated as a U.S. person.

The tax consequences of the Merger to each stockholder will depend on such stockholder’s own situation. US Airways Group stockholders are urged to read the discussion in the section entitled “The Merger—Material U.S. Federal Income Tax Consequences” beginning on page 103, and to consult their tax advisers as to the U.S. federal income tax consequences of the Merger, as well as the effects of other federal, state, local, and non-U.S. tax laws.

Accounting Treatment (see page 105)

AMR prepares its financial statements in accordance with GAAP. The Merger will be accounted for using the acquisition method of accounting. AMR will be treated as the acquirer for accounting purposes. Upon emergence from Chapter 11, AMR will finalize all appropriate accounting entries associated with the Plan and adopt “fresh start” accounting in accordance with the Financial Accounting Standards Board’s Accounting Standards Classification (“ASC”) 852, “Reorganizations.” Fresh start accounting requires resetting the historical net book value of assets and liabilities to fair value by assigning AMR’s reorganization value to the fair value of its assets and liabilities pursuant to ASC 805. See the section entitled “The Merger—Accounting Treatment” beginning on page 105 and Note 3 to the unaudited pro forma condensed combined financial statements beginning on page 164.

Risk Factors (see page 41)

In evaluating the Merger and the Merger Agreement, you should carefully read this proxy statement/prospectus and especially consider the factors discussed in the section entitled “Risk Factors” beginning on page 41.

Comparative Per Share Market Price Data

For a detailed description of comparative market prices, see the section entitled “Comparative Per Share Market Price Data” beginning on page 145.

US Airways Group common stock currently trades on the NYSE under the symbol “LCC.” Prior to the commencement of the Chapter 11 Cases and continuing through January 5, 2012, AMR’s common stock was traded on the NYSE under the symbol “AMR.” On December 29, 2011, the NYSE announced that it would suspend trading and move to delist AMR’s common stock. AMR’s common stock was delisted effective January 5, 2012. As a result, on January 5, 2012, AMR’s common stock began trading on the over-the-counter market under the symbol “AAMRQ.”

The table below sets forth, for the periods indicated, the range of high and low per share sales prices for AMR common stock as reported on the NYSE and over-the-counter market, as applicable, and for US Airways Group common stock as reported on the NYSE. For current price information, you should consult publicly available sources. Neither AMR nor US Airways Group paid any dividends during these periods.

The historical price information of US Airways Group stock does not necessarily reflect, and the historical price information of AMR common stock does not reflect the price at which AAG common stock will trade following the Merger. The Plan contemplates the cancellation of all currently outstanding equity securities of AMR. Therefore, it is not meaningful to determine the value of the Merger consideration by reference to current trading values of AMR common stock. Neither AMR nor US Airways Group can anticipate the price at which AAG common stock will trade following the Closing. For information on the financial forecasts developed by AMR management (the “AMR Forecasts”), the financial forecasts developed by US Airways Group management

(the “US Airways Group Forecasts”), and the financial forecasts developed by AMR management and US Airways Group management (the “AAG Disclosure Statement Forecasts,” and, together with the AMR Forecasts and the US Airways Group Forecasts, the “Forecasts”), see the section entitled “The Merger—General Information regarding Forecasts and Expected Synergies” beginning on page 97.

The following table presents:

in each case, on February 13, 2013, the last full trading day prior to the public announcement of the proposed Merger, and on May 17, 2013, the last practicable trading day prior to the date of this proxy statement/prospectus.

As noted above, because the Plan contemplates the cancellation of all currently outstanding securities of AMR, the historical price information of AMR common stock does not reflect the price at which AAG common stock will trade following the Closing.

Selected Consolidated Financial Data

Selected Consolidated Financial Data of AMR

The selected consolidated financial data presented below under the captions “Consolidated statements of operations data” and “Consolidated balance sheet data” for the years ended December 31, 2012, 2011, and 2010 and as of December 31, 2012 and 2011 are derived from AMR’s audited consolidated financial statements included in this proxy statement/prospectus. See the section entitled “Unaudited Pro Forma Condensed Combined Financial Statements” beginning on page 154. The selected consolidated financial data for the years ended December 31, 2009 and 2008 and as of December 31, 2010, 2009, and 2008 are derived from AMR’s audited consolidated financial statements for such years, which have not been included in, or incorporated by reference into, this proxy statement/prospectus. See the section entitled “Additional Information” beginning on page 336.

The consolidated statement of operations data for the three months ended March 31, 2013 and 2012, and the consolidated balance sheet data as of March 31, 2013 have been derived from the AMR unaudited interim

condensed consolidated financial statements for the three months ended March 31, 2013, included in this proxy statement/prospectus. The balance sheet data as of March 31, 2012, has been derived from the AMR unaudited interim condensed consolidated financial statements for such periods, which have not been included in, or incorporated by reference into, this proxy statement/prospectus. These financial statements are unaudited, but, in the opinion of AMR’s management, contain all adjustments necessary to present fairly AMR’s consolidated financial position, results of operations, and cash flows for the periods indicated.

You should read this selected consolidated financial data together with the financial statements of AMR that are included in this proxy statement/prospectus and their accompanying notes and management’s discussion and analysis of financial condition and results of operations of AMR contained in this proxy statement/prospectus. See the AMR unaudited interim condensed consolidated financial statements for the three months ended March 31, 2013 beginning on page F-2 and the AMR 2012 consolidated financial statements beginning on page F-31.