1. (

• air_passage ,
• air_duct ,
• airway ,

) a duct that provides ventilation (as in mines) ;

2. (

• air_lane ,
• flight_path ,
• airway ,
• skyway

) a designated route followed by airplanes in flying from one airport to another ;

3. (

• respiratory_tract ,
• airway

) the passages through which air enters and leaves the body ;

4. (

• airline ,
• airline_business ,
• airway

) a commercial enterprise that provides scheduled flights for passengers ;