 Aircraft can land in fog at airports equipped with radar-assisted ground-controlled approach systems in which the plane's position is observed on radar screens by operators who thereby give radio landing instructions to the pilot, maintaining the aircraft on a defined approach path to the runway.Military fighter aircraft are usually fitted with air-to-air targeting radars, to detect and target enemy aircraft.In addition, larger specialized military aircraft carry powerful airborne radars to observe air traffic over a wide region and direct fighter aircraft towards targets.