Modern fighter aircraft have automated deflection sights, where a computer calculates lead and projects the solution onto a head-up display (HUD).
Due to the Earth's rotation, surface points have different velocities and curved motion, leading to apparent Coriolis drift of a long-range target.
Computer games that accurately model the ballistic trajectories (including velocity) of firearms also require leading of fire, much as in real life.
Additionally, in older multiplayer video games that calculate behavior on a remote server, even for high-velocity or hitscan weapons, there are issues of latency that may require leading.
Such systems eliminate the need to lead hitscan weapons, but introduce the risk of players being hit by enemy fire shortly after taking cover behind objects, due to the latency causing a delay before the victim's computer receives the message that he has been shot.