A designated route followed by airplanes in flying from one airport to another
Else clues• 747's route
• American or Delta route
• Breathing space
• Jet route
• Liner's route
• Plane's passage
• Respiration aid
• Sky path
• Trachea, e.g.
• Vent
• Ventilation shaft
• Vital anatomical passage
• Windpipe, e.g.
• Windpipe, for one
• A duct that provides ventilation as in mines
• A commercial enterprise that provides scheduled flights for passengers