air lane vs skyway

air lane and skyway both are nouns.

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

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

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

Other synonyms of air lane include airway, flight path.

air lane (noun)	skyway (noun)
a designated route followed by airplanes in flying from one airport to another	a designated route followed by airplanes in flying from one airport to another