airway vs itinerary

airway and itinerary both are nouns.

Word	Noun	Adjective	Verb	Adverb
airway	Yes	No	No	No
itinerary	Yes	No	No	No

As nouns, itinerary is a hypernym of airway; that is, itinerary is a word with a broader meaning than airway:

airway: a designated route followed by airplanes in flying from one airport to another
itinerary: an established line of travel or access

Other hypernyms of airway include path, route.

airway (noun)	itinerary (noun)
a commercial enterprise that provides scheduled flights for passengers	a proposed route of travel
a duct that provides ventilation (as in mines)	a guidebook for travelers
the passages through which air enters and leaves the body	an established line of travel or access
a designated route followed by airplanes in flying from one airport to another