AirTran's integration will be completed this year. Its Boeing 717s are being leased to Delta.

A 737-500 taking off from Las Vegas, with the Luxor Hotel and casino behind.

Several Southwest 737s are 'logojets’ carrying adverts.

Boeing 737-700 N714CB at Los Angeles International Airport - one of three ‘retrojets’ that wear Southwest's former ‘desert gold’ livery.

AirTran's integration will be completed this year. Its Boeing 717s are being leased to Delta.