Air support tower is a Nod structure, this building supports the Nod air tower by providing Vertigo bombers with a place to rearm, refuel and undergo repair. Similar to the air tower, it can support four Vertigo bombers, but it is much cheaper to produce. However, it cannot construct any aircraft itself; therefore, an air tower must be built before any support towers can be constructed.
The Black Hand utilizes neither aircraft, nor these structures.
Combat support airfield - GDI counterpart