Southwest Airlines

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** FILE ** A Southwest Airlines Boeing 737 waits to take off at Chicago's Midway International Airport as another lands on Feb. 10, 2012. (Associated Press)

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** FILE ** In this Feb. 9, 2012, file photo, a Southwest Airlines Boeing 737 waits to take off at Chicago's Midway Airport as another lands. (AP Photo/Charles Rex Arbogast, File)

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A member of the National Transportation Safety Board investigating the emergency landing of Southwest Airlines Flight 812 cuts away a portion of the plane's fuselage on Sunday in Yuma, Ariz. (AP Photo)

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A cellphone photo provided by passenger Joshua Hardwicke shows an apparent hole in the cabin of a Southwest Airlines Boeing 373-300 on Friday, April 1, 2011, as it makes an emergency decent into Yuma, Ariz. (AP Photo/Joshua Hardwicke)

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Southwest Airlines flight 812 passenger Mary Flores, left, is hugged by her granddaughter, Dylan Dean, 9, center and daughter Desiree, right, after arriving at Sacramento International Airport Friday, April 1, 2011. A fuselage rupture and a sudden drop in cabin pressure forced the flight from Phoenix to Sacramento to make an emergency landing at a Yuma military base Friday. (AP Photo/Rich Pedroncelli)

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A March 13, 2010 photo shows people boarding a Southwest Airlines jet at Burbank, Calif., Airport. Southwest Airlines is revamping its frequent-flier program with changes designed to nudge customers into buying higher-priced tickets by letting them earn bonus flights faster. (AP Photo/Paul Sakuma)