A glitch in Call of Duty: Warzone allows players to fly around the map using recon drones.
To perform the glitch, begin by deploying your recon drone into your teammate's character model. Once the drone is clipping into the character model, that teammate has to activate their drone. When they do, they'll become attached to your drone and you'll be able to fly them around the map. You can then pilot the drone wherever you like, then exit the drone to place the character wherever the drone is.
The technique can be used to reach locations that are otherwise inaccessible, including invisible barriers in certain parts of the map that allow the player to stand in the air indefinitely.
The glitch was discovered before the release of Modern Warfare and Warzone Season 5, so it's possible Infinity Ward has since patched it out of the game.