FILE - In this June 5, 2008 file photo, a tug pushes a Southwest Airlines jetliner away from a gate at Seattle/Tacoma International airport in SeaTac, Wash. Southwest Airlines Co. posts a surprisingly large loss in the first quarter Thursday, April 16, 2009, as traffic fell. AP Photo logo AP Photo 6 months ago

FILE - In this June 5, 2008 file photo, a tug pushes a Southwest Airlines jetliner away from a gate at Seattle/Tacoma International airport in SeaTac, Wash. Southwest Airlines Co. posts a surprisingly large loss in the first quarter Thursday, April 16, 2009, as traffic fell.