- air passage, air duct, airway - a duct that provides ventilation (as in mines)
--1 is a kind of duct
--1 has parts: vent, venthole, vent-hole, blowhole
--1 has particulars:register; snorkel, schnorkel, schnorchel, snorkel breather, breather; upcast; ventilation shaft - air lane, flight path, airway, skyway - a designated route followed by airplanes in flying from one airport to another
--2 is a kind of path, route, itinerary
--2 has particulars:approach path, approach, glide path, glide slope; holding pattern - airline, airline business, airway - a commercial enterprise that provides scheduled flights for passengers
--3 is a kind of line
--3 has parts: fleet