airline business vs airway

airline business and airway both are nouns.

Word	Noun	Adjective	Verb	Adverb
airline business	Yes	No	No	No
airway	Yes	No	No	No

As nouns, airline business and airway are synonyms defined as:

airline business and airway: a commercial enterprise that provides scheduled flights for passengers

Other synonyms of airline business include airline.

airline business (noun)	airway (noun)
a commercial enterprise that provides scheduled flights for passengers	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