Robert Isom, head of operations at US Airways, said the FAA furloughs were like a "wildcat regulatory action".

BBC: Congress passes bill to end widespread airline delays

In a letter to its employees, US Airways Chief Operating Officer Robert Isom called the FAA announcement disappointing.

CNN: US Airways, United face FAA fines for safety violations

"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