Helicopters are on I think 4 of 8 game-modes and 7 of 9 maps.

Maps - Isn't on Bank Job, Growhouse or The Block?

Game-modes - Isn't on Rescue, Crosshair, Teamdeath Match, or Heist



Maps - Is on Dust Bowl, Downtown, Riptide, Hollywood Heights, Everglades, Derailed

Games-modes - Is on Hotwire, Conquest Small?, Conquest Large, and Blood Money

? = Not Sure
_ = Changed