a duct that delivers ventilation as in mines
- a designated course followed closely by airplanes in flying from one airport to some other
- the passages whereby environment enters and will leave your body
- a duct that delivers air flow (as in mines)
- a business enterprise that delivers scheduled flights for people
the road that environment follows to get involved with and from the lungs. The lips and nose will be the typical entry and exit harbors for the airway. Entering atmosphere after that passes through the back of the throat (pharynx) and continues through voice field (larynx), down the trachea, to finally move across the bronchi.