The Collaborative International Dictionary of English v.0.48:

airway \airway\ n.
   1. a duct that provides ventilation, as in mines.

   Syn: air passage, air duct.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

airway
    n 1: a duct that provides ventilation (as in mines) [syn: air
         passage, air duct, airway]
    2: a designated route followed by airplanes in flying from one
       airport to another [syn: air lane, flight path, airway,
       skyway]
    3: the passages through which air enters and leaves the body
       [syn: respiratory tract, airway]
    4: a commercial enterprise that provides scheduled flights for
       passengers [syn: airline, airline business, airway]