1.  airway(n = noun.artifact) air duct, air passage - a duct that provides ventilation (as in mines);
is a kind of duct
has parts: blowhole, vent, vent-hole, venthole
has particulars: register, breather, schnorchel, schnorkel, snorkel, snorkel breather, upcast, ventilation shaft

2.  airway(n = noun.location) air lane, flight path, skyway - a designated route followed by airplanes in flying from one airport to another;
is a kind of itinerary, path, route
has particulars: approach, approach path, glide path, glide slope, holding pattern

3.  airway(n = noun.body) respiratory tract - the passages through which air enters and leaves the body;
is a kind of tract
is a part of respiratory system, systema respiratorium
has particulars: lower respiratory tract, upper respiratory tract

4.  airway(n = noun.artifact) airline, airline business - a commercial enterprise that provides scheduled flights for passengers;
is a kind of line
has parts: fleet

   a duct that provides ventilation, as in mines. [WordNet 1.5]

airway, n.
1 a a recognized route followed by aircraft. b (often in pl.) = AIRLINE.
2 a ventilating passage in a mine.