The Collaborative International Dictionary of English v.0.48:

Stewardess \Stew"ard*ess\, n.
   A female steward; specifically, a woman employed in passenger
   vessels to attend to the wants of female passengers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stewardess
    n 1: a woman steward on an airplane [syn: stewardess, air
         hostess, hostess]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "stewardess":
   Ganymede, Hebe, aerial photographer, aircrew, aircrewman,
   airline hostess, airline stewardess, attendant, avigator, bakehead,
   batman, bellboy, bellhop, bellman, belly gunner, black gang,
   boilerman, bombardier, bootblack, boots, bungs, cabin boy, caddie,
   chips, chore boy, commissary steward, complement, copyboy, crew,
   crew chief, cupbearer, deckhand, deckie, errand boy, errand girl,
   fireman, flight attendant, flight crew, footboy, gofer, gun loader,
   gunner, hand, hospital steward, hostess, landing signalman,
   machine gunner, mail orderly, meteorologist, navigator, office boy,
   office girl, oiler, orderly, page, purser, radio operator,
   roustabout, snip, snips, sparks, squire, steward, stoker, tender,
   torpedoman, trainbearer, usher, watch, yeoman