Related Clues:

• Windpipe, e.g.
• Vent
• Flight fleet
• Breathing space
• Trachea, e.g.
• Windpipe
• Plane's passage
• Respiration aid
• American or Delta route
• Vital anatomical passage
• Ventilation shaft
• Windpipe, for one
• Plane's route
• Pilot's route
• Freshen passage in ventilation shaft