air lane vs airway

air lane and airway both are nouns.

Word	Noun	Adjective	Verb	Adverb
air lane	Yes	No	No	No
airway	Yes	No	No	No

As nouns, air lane and airway are synonyms defined as:

air lane and airway: a designated route followed by airplanes in flying from one airport to another

Other synonyms of air lane include flight path, skyway.

air lane (noun)	airway (noun)
a designated route followed by airplanes in flying from one airport to another	a commercial enterprise that provides scheduled flights for passengers
	a duct that provides ventilation (as in mines)
	the passages through which air enters and leaves the body
	a designated route followed by airplanes in flying from one airport to another