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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 SCHEDULE 13G/A


                   Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                              Seacor Holdings Inc.
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                   811904101

                                 (CUSIP Number)

                               December 31, 2007
            (Date of Event Which Requires Filing of This Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

[_]  Rule 13d-1(b)
[X]  Rule 13d-1(c)
[_]  Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

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CUSIP No. 811904101               SCHEDULE 13G                    Page 2 of 8
-----------------------                                  ----------------------

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1       Name of Reporting Person:

        KENSICO CAPITAL MANAGEMENT CORPORATION

        I.R.S. Identification Nos. of Above Persons (entities only)

        13-4079277
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2       Check the Appropriate Box if a Member of a Group:
                                                                (a)   [_]
                                                                (b)   [_]
--------------------------------------------------------------------------------
3       SEC Use Only


--------------------------------------------------------------------------------
4       Citizenship or Place of Organization:

        Delaware
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                                     5       Sole Voting Power
             Number of
                                             1,684,540
               Shares                -------------------------------------------
                                     6       Shared Voting Power
            Beneficially
                                             -0-
             Owned by                -------------------------------------------
                                     7       Sole Dispositive Power
               Each
                                             1,684,540
          Reporting Person           -------------------------------------------
                                     8       Shared Dispositive Power
               With
                                             -0-
--------------------------------------------------------------------------------
9       Aggregate Amount Beneficially Owned by Each Reporting Person:

        1,684,540
--------------------------------------------------------------------------------
10      Check Box If the Aggregate Amount in Row (9) Excludes
        Certain Shares:
                                                                      [_]
--------------------------------------------------------------------------------
11      Percent of Class Represented by Amount in Row (9):

        7.3%
--------------------------------------------------------------------------------
12      Type of Reporting Person:

        CO
--------------------------------------------------------------------------------


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CUSIP No. 811904101               SCHEDULE 13G                    Page 3 of 8
-----------------------                                  ----------------------

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1       Name of Reporting Person:

        MICHAEL LOWENSTEIN

        I.R.S. Identification Nos. of Above Persons (entities only)

--------------------------------------------------------------------------------
2       Check the Appropriate Box if a Member of a Group:
                                                                (a)   [_]
                                                                (b)   [_]
--------------------------------------------------------------------------------
3       SEC Use Only

--------------------------------------------------------------------------------
4       Citizenship or Place of Organization:

        United States of America
--------------------------------------------------------------------------------
                                     5       Sole Voting Power
             Number of
                                             1,684,540
               Shares                -------------------------------------------
                                     6       Shared Voting Power
            Beneficially
                                             -0-
             Owned by                -------------------------------------------
                                     7       Sole Dispositive Power
               Each
                                             1,684,540
          Reporting Person           -------------------------------------------
                                     8       Shared Dispositive Power
               With
                                             -0-
--------------------------------------------------------------------------------
9       Aggregate Amount Beneficially Owned by Each Reporting Person:

        1,684,540
--------------------------------------------------------------------------------
10      Check Box If the Aggregate Amount in Row (9) Excludes
        Certain Shares:
                                                                      [_]
--------------------------------------------------------------------------------
11      Percent of Class Represented by Amount in Row (9):

        7.3%
--------------------------------------------------------------------------------
12      Type of Reporting Person:

        IN; HC
--------------------------------------------------------------------------------


-----------------------                                  ----------------------
CUSIP No. 811904101               SCHEDULE 13G                    Page 4 of 8
-----------------------                                  ----------------------

--------------------------------------------------------------------------------
1       Name of Reporting Person:

        THOMAS J. COLEMAN

        I.R.S. Identification Nos. of Above Persons (entities only)

--------------------------------------------------------------------------------
2       Check the Appropriate Box if a Member of a Group:
                                                                (a)   [_]
                                                                (b)   [_]
--------------------------------------------------------------------------------
3       SEC Use Only

--------------------------------------------------------------------------------
4       Citizenship or Place of Organization:

        United States of America
--------------------------------------------------------------------------------
                                     5       Sole Voting Power
             Number of
                                             1,684,540
               Shares                -------------------------------------------
                                     6       Shared Voting Power
            Beneficially
                                             -0-
             Owned by                -------------------------------------------
                                     7       Sole Dispositive Power
               Each
                                             1,684,540
          Reporting Person           -------------------------------------------
                                     8       Shared Dispositive Power
               With
                                             -0-
--------------------------------------------------------------------------------
9       Aggregate Amount Beneficially Owned by Each Reporting Person:

        1,684,540
--------------------------------------------------------------------------------
10      Check Box If the Aggregate Amount in Row (9) Excludes
        Certain Shares:
                                                                      [_]
--------------------------------------------------------------------------------
11      Percent of Class Represented by Amount in Row (9):

        7.3%
--------------------------------------------------------------------------------
12      Type of Reporting Person:

        IN; HC
--------------------------------------------------------------------------------


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CUSIP No. 811904101               SCHEDULE 13G                    Page 5 of 8
-----------------------                                  ----------------------


Item 1(a).        Name of Issuer:

                  Seacor Holdings Inc. (the "Company")

Item 1(b).        Address of Issuer's Principal Executive Offices:

                  2200 Eller Drive
                  P.O. Box 13038
                  Fort Lauderdale, FL 33316, United States


Item 2(a).        Name of Persons Filing:

                  The Statement is filed on behalf of each of the following
                  persons (collectively, the "Reporting Persons"):

                  (i)    Kensico Capital Management Company ("Kensico Capital
                         Management");

                  (ii)   Michael Lowenstein ("Mr. Lowenstein"); and

                  (iii)  Thomas J. Coleman ("Mr. Coleman").

                  This statement relates to shares of Common Stock of the
                  Company held for the accounts of Kensico Partners, L.P., a
                  Delaware limited partnership ("Kensico Partners"), Kensico
                  Associates, L.P., a Delaware limited partnership ("Kensico
                  Associates"), Kensico Offshore Fund, Ltd., a limited
                  liability company organized under the laws of the Cayman
                  Islands, B.W.I. ("Kensico Offshore"), and Kensico Drawdown
                  Fund, L.P., a Delaware limited partnership ("Kensico
                  Drawdown" and, together with Kensico Partners, Kensico
                  Associates and Kensico Offshore, the "Funds"). Kensico
                  Capital Management serves as investment manager to the Funds
                  and, in such capacity, may be deemed to have voting and
                  dispositive power over the shares held for the accounts of
                  the Funds. Kensico Capital LLC, a Delaware limited liability
                  company ("Kensico Capital"), serves as General Partner of the
                  Funds, other than Kensico Offshore and Kensico Drawdown.
                  Kensico Drawdown LLC, a Delaware limited liability company,
                  serves as General Partner of Kensico Drawdown. Mr. Lowenstein
                  and Mr. Coleman serve as Co-Presidents of Kensico Capital
                  Management and are Managing Members of Kensico Capital and
                  Kensico Drawdown LLC.

Item 2(b).        Address of Principal Business Office:

                  For each Reporting Person:

                  Michael Lowenstein
                  Kensico Capital Management Corporation
                  55 Railroad Avenue, 2nd Floor
                  Greenwich, Connecticut 06830


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CUSIP No. 811904101               SCHEDULE 13G                    Page 6 of 8
-----------------------                                  ----------------------


Item 2(c).        Citizenship:

                  See row 4 of each Reporting Persons' cover page.

Item 2(d).        Title of Class of Securities: Common Stock

Item 2(e).        CUSIP Number: 811904101

Item 3.           Not applicable.

Item 4.           Ownership.

                  For each Reporting Person:

                  (a)    Amount beneficially owned:

                  As of December 31, 2007, each of Kensico Capital Management,
                  Mr. Lowenstein and Mr. Coleman may be deemed to be the
                  beneficial owner of the 1,684,540 shares of Common Stock held
                  for the accounts of the Funds. Kensico Partners owns
                  beneficially 375,800 shares of Common Stock, Kensico
                  Associates owns beneficially 509,440 shares of Common Stock,
                  Kensico Offshore owns beneficially 654,500 shares of Common
                  Stock and Kensico Drawdown owns beneficially 144,800 shares
                  of Common Stock.

                  (b)    Percent of class:

                         7.3% of the total outstanding shares of Common Stock,
                         from which Kensico Partners, Kensico Associates,
                         Kensico Offshore and Kensico Drawdown own 1.6%,
                         2.2%, 2.9% and 0.6%, respectively. This percentage
                         is based upon 23,147,246 shares of Common Stock issued
                         and outstanding (the number of shares of Common Stock
                         reported in the Company's Form 10-Q filed November 2,
                         2007).

                  (c)    Number of shares to which each Reporting Person has:

                         (i)    Sole power to vote or direct the vote:
                                1,684,540

                         (ii)   Shared power to vote or direct the vote: -0-

                         (iii)  Sole power to dispose or to direct the
                                disposition of: 1,684,540

                         (iv)   Shared power to dispose of or direct the
                                disposition of: -0-

Item 5.           Ownership of Five Percent or Less of a Class.

                  Not Applicable.

Item 6.           Ownership of More than Five Percent on Behalf of Another
                  Person.


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CUSIP No. 811904101               SCHEDULE 13G                    Page 7 of 8
-----------------------                                  ----------------------


                  (i)    The partners of Kensico Partners have the right to
                  participate in the receipt of dividends from, or proceeds
                  from the sale of, the shares held by Kensico Partners in
                  accordance with their partnership interests in Kensico
                  Partners.

                  (ii)   The partners of Kensico Associates have the right to
                  participate in the receipt of dividends from, or proceeds
                  from the sale of, the shares held by Kensico Associates in
                  accordance with the partnership interests in Kensico
                  Associates.

                  (iii)  The shareholders of Kensico Offshore have the right to
                  participate in the receipt of dividends from, or proceeds
                  from the sale of, the shares held by Kensico Offshore in
                  accordance with their ownership interests in Kensico
                  Offshore.

                  (iv)   The partners of Kensico Drawdown have the right to
                  participate in the receipt of dividends from, or proceeds
                  from the sale of, the shares held by Kensico Drawdown in
                  accordance with their partnership interests in Kensico
                  Drawdown.

Item 7.           Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported By the Parent Holding
                  Company.

                  Not Applicable.

Item 8.           Identification and Classification of Members of the Group.

                  Not Applicable.

Item 9.           Notice of Dissolution of a Group.

                  Not Applicable.

Item 10.          Certification.

                  By signing below I certify that, to the best of my knowledge
                  and belief, the securities referred to above were not
                  acquired and are not held for the purpose of or with the
                  effect of changing or influencing the control of the issuer
                  of the securities and were not acquired and are not held in
                  connection with or as a participant in any transaction having
                  that purpose or effect.



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CUSIP No. 811904101               SCHEDULE 13G                    Page 8 of 8
-----------------------                                  ----------------------


                                   SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:   February 14, 2008


                                  KENSICO CAPITAL MANAGEMENT CORPORATION


                                  BY:     /s/ Michael Lowenstein
                                  ----------------------------------------
                                                  Signature


                                  Michael Lowenstein, Authorized Signatory
                                  ----------------------------------------
                                                  Name/Title



                                  MICHAEL LOWENSTEIN


                                          /s/ Michael Lowenstein
                                  ----------------------------------------
                                                  Signature



                                  THOMAS J. COLEMAN


                                           /s/ Thomas J. Coleman
                                  ----------------------------------------
                                                  Signature