- Go to a Hangar, I went to "Landsdowne Airstrip
- Then select a plane and pull it out of the hanger (about 2 plane lengths).
- Go back and spawn a 2nd one, also pull it out behind the other one.
- Spawn a 3rd one and blown up the other 2 (go forward slightly then back up to get your machine guns pointed up)
- Rinse & repeat 5 times to get the achievement