What is a request for a fighter to leave formation called?

The term "Split" refers to the maneuver in which a fighter is directed to exit a formation, allowing it to move independently. This action is typically used in combat scenarios where a unit may need to disperse to engage multiple targets or to reduce vulnerability to enemy defenses by not presenting a single target. Splitting formation helps maintain tactical flexibility and allows pilots to provide cover for each other while also striking the enemy more effectively.

In contrast, the other options have different meanings in a flying context. The term "Break" is used when pilots need to disengage from an engagement or reposition quickly, usually to gain distance from an enemy or to regroup. "Reform" is the action of returning to the established formation after having split apart or maneuvered. "Separate" generally implies a broad dispersal that might not be in alignment with rejoining a formation, lacking the tactical intent associated with the term "Split."