Southwest operated several 727's between 1979 and 1985. This ex-Braniff -291 series aircraft was leased from 3/79 to 1/80. It was part of a settlement between Braniff and Southwest regarding Southwest's right use DAL. The other aircraft operated were N551PE, N561PE, N563PE, N564PE, N566PE, N569PE. All of these were -227 series obtained from People Express. They were orginaly with Braniff.