air traveler vs air traveller

air traveler and air traveller both are nouns.

Word	Noun	Adjective	Verb	Adverb
air traveler	Yes	No	No	No
air traveller	Yes	No	No	No

As nouns, air traveler and air traveller are synonyms defined as:

air traveler (noun)	air traveller (noun)
someone who travels by airplane	someone who travels by airplane