As indicated by U-2 fuel bar texture in game files, possibly the player originally controlled the U-2 in game, or it is the time of how long the Spy Plane appears in-game.
Unlike in previous games, the Spy Plane is a slightly rarer sight due to many players removing it as soon as possible for the other 3-killstreak, the RC-XD, believing that an RC-XD, which is almost a free kill every 3 kills, is better than the ability to get one or more kills with work.
Destroying a Spy Plane grants the player 75 XP. Calling one in grants 100 XP.
If the player calls in a spy plane while host migration is in progress, when the match resumes the user will be stuck holding the spy plane detonator until they die.
In the closed multiplayer beta, the Spetsnaz announcer referred to the Spy Plane as the U-2. In the Italian version, all factions refer it as the U-2
Unlike the UAV Recon, players cannot see friendly planes when they are in the air. This is useful when trying to destroy an enemy Spy Plane.