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Synonyms for Airway (same or very similar meaning)

WordNet sense 1 (a designated route followed by airplanes in flying from one airport to another):
skyway, air lane, flight path

WordNet sense 2 (the passages through which air enters and leaves the body):
respiratory tract

WordNet sense 3 (a duct that provides ventilation (as in mines)):
air passage, air duct

WordNet sense 4 (a commercial enterprise that provides scheduled flights for passengers):
airline, airline business

From the ODE community, based on WordNetadd/edit