air ways

名词 air way:

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