Helicopters became a staple of Warzone’s Battle Royale battlefield but, in a recent update, have been removed.
This is most likely due to the latest hack where you could fly a helicopter under the map to win the game.
Currently, there is no indication of when they will be returned to the game. However, as they are still part of the map’s legend, we can assume that they should return for some more death from above in the near future!