Here's The Boeing E-3 Sentry AWACS Advanced Flying Radar US Air Force and Nato

The system is used offensively to direct fighters to their target locations, and defensively, directing counterattacks on enemy forces, both air and ground.

AWACS (Airborne Warning and Control System) is the name of the specific system installed in the E-3 and Japanese Boeing E-767 AEW&C airframes, but is often used as a general synonym for AEW&C.

The E-3 Sentry is a modified Boeing 707/320 commercial airframe with a rotating radar dome. The dome is 30 feet (9.1 meters) in diameter, six feet (1.8 meters) thick, and is held 11 feet (3.33 meters) above the fuselage by two struts.