Possible Clues:

• Trachea
• The trachea
• Air passage
• Polish harbour in top destination has parking space for internal airline
• Blow whistle for a breathing space
• Tube that takes air from the throat to the lungs
• Legal beagle trapping one in port's air duct?
• Common name for the trachea
• The trachea, less formally
• The common trachea