1. A designated area in a hostile or threatened territory which, when seized and held, ensures the continuous air landing of troops and material and provides maneuver space necessary for projected operations. Normally it is the area seized in the assault phase of an airborne operation. 2. A designated location in an area of operations used as a base for supply and evacuation by air. (Army) - The airhead contains enough DropZones (DZs), LandingZones (LZs), and extraction zones (EZs) to ensure mass, interior lines of communication, and defense in depth. See FMs 71-100-2, 90-4, and JP 3-18.1.