airline business vs airline

airline business and airline both are nouns.

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

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

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

Other synonyms of airline business include airway.

airline business (noun)	airline (noun)
a commercial enterprise that provides scheduled flights for passengers	a commercial enterprise that provides scheduled flights for passengers
	a hose that carries air under pressure