Airlines fall over low fare concerns

Concerns that low fuel expenses will prompt airlines to cut air fares sent shares of American Airlines Group Inc. (Nasdaq: AAL) plummeting $4.79 to close at $43.06, United Continental Holdings Inc. (NYSE: UAL) plunging $6.27 to close at $54.54 and Southwest Airlines Co. (NYSE: LUV) tumbling $3.72 to close at $37.19.