The Aerostat is an airborne reconnaisance drone created by Skynet that appears in Terminator Salvation. It is roughly the size of the average car wheel and keeps itself aloft with the turbofan engine that makes up most of its body. Aerostats are used by Skynet to seek out human hiding places and can identify specific targets on Skynet's kill-lists using facial recognition software. When a group of targets is located, the Aerostats will signal nearby Terminators or other Skynet machines to converge upon the target area and kill or capture humans as necessary. Aerostats do not have any weapons and their rotary engines can be jammed by any solid object thrown into them, causing the unit to crash.