One of the mysteries of the English language finally explained.
The skill or practice of aiming and firing guns from on board a military aircraft (also) a division of an army or air force concerned with this.
1920s; earliest use found in The San Antonio Express-News. From air + gunnery, after air gunner.
air gunnery/ˈɛː ˌɡʌn(ə)ri/
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