5/5/2008 11:09:31 AM -- Seattle, WA, U.S.A.Southwest Airlines ground crew member Michael Delight, 37, disconnects a precondition air unit from a Southwest Airlines jet at Seattle International Airport Monday May 5, 2008 in Seattle. The precondition air unit allows the jet to shut off its auxiliary power unit while on the ground at the gate saving on jet fuel and reducing emissions.  .
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