Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
air-to-air is an adjective meaning "operating between or launched from or involving rockets or aircraft in flight". It carries one recorded sense.
operating between or launched from or involving rockets or aircraft in flight
“air-to-air missiles”
“air-to-air communications”
Definitions, synonyms and semantic relations for air-to-air come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.