This can easily boosted with yourself at any hangar location on the map. First you'll want to spawn a plane with machine guns on it, like the Carmina
or The Wild Goose
. Once spawned, move it slightly forward and turn it around for it to face the spawn location for the hangar. Go back to the hangar and spawn another plane. Head your original plane, and destroy the newly spawned plane. Repeat this process until the achievement unlocks.
You can also use a similar method to unlock:
The Death From Above achievement in Far Cry 5 worth 40 pointsDrop a bomb from a plane and destroy or disable 4 vehicles at once (Campaign only). The The Hurk Locker achievement in Far Cry 5 worth 19 pointsTruly bond with Hurk by destroying 15 vehicles together (Campaign only).