WordNet (r) 3.0 (2006):

deplane
    v 1: get off an airplane

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "deplane":
   alight, come to land, debark, debus, detrain, disembark,
   disemplane, dock, drop anchor, go ashore, land, make a landfall,
   make land, make port, moor, put in, put into port, reach land,
   tie up, unboat