After a certain amount of time the game will inform you that an airdrop is about to take place. You will be given its location on the map and it is advised that if you are in area to get there as fast as you can as being the first to reach it will enable you to claim the goodies inside, these will include premium gears and useful items as well as a rare gun which will instantly improve your chances of surviving as you will be able to eliminate enemies easier.