The merger would give a combined American and US Airways Group Inc. the ability to increase fares.

WSJ: What an American-US Airways merger means for you

"We're not working in partnership with the FAA, " said Robert Isom, chief operating officer at US Airways Group Inc.

WSJ: Senators Seek Way to Ease FAA Cuts

These stocks are: American International Group Inc. ( AIG), Ford Motor Co. ( F), Vale SA ( VALE) and US Airways Group Inc. ( LCC).

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