The path air follows to get into and out of the lungs. The mouth and nose are the normal entry and exit ports. Entering air then passes through the back of the throat (pharynx), continues through the voice box (larynx), down the trachea, and finally out the branching tubes known as bronchi. See the entire definition of Airway
In aviation, an airway is a designated route in the air. Airways are laid-out between navigation aids such as VORs and NDB's (NDB-based airways are rare in the United States, but are more common in much of the rest of the world).
The airways in which controlled flights fly are internationally agreed and represented by geographic coordinates. These coordinates are entered into the FMS (â€“), and help pilots to find their way. (â€“ Waypoint, Reporting point)