· a duct that provides ventilation (as in mines)
Synonym(s): air_passage, air_duct
Hypernym(s): duct
· a designated route followed by airplanes in flying from one airport to another
Synonym(s): air_lane, flight_path, skyway
Hypernym(s): path, route, itinerary
· the passages through which air enters and leaves the body
Synonym(s): respiratory_tract
Hypernym(s): tract
· a commercial enterprise that provides scheduled flights for passengers
Synonym(s): airline, airline_business
Hypernym(s): line