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The E-3 Sentry, the Airborne Warning and Control System, grew out of the look-down problem: the 1960s Lockheed EC-121 Warning Star could not pick low-flying jets out of ground clutter. Westinghouse beat favored Hughes Aircraft with a digital radar that used an 18-bit programmable computer and a fast Fourier transform to sort returns by Doppler shift and ignore the stationary ground. In 1970 the Air Force chose the Boeing 707-320B airframe over a McDonnell Douglas DC-8 proposal. The rotodome is 30 feet across, 6 feet thick, over two tons, mounted 11 feet above the fuselage and turning at six revolutions per minute, with generators on all four engines producing one megawatt.

Engineers tilted the rotodome nose-down to cut drag, then used electronic phase shifters to steer the beam back to level. Upgrades added GPS and Link 16 in Blocks 30 and 35, new computers under RSIP, glass cockpits under DRAGON, and a Red Hat Linux mission system in Blocks 40 and 45, which a 2016 test judged not survivable in a cyber-contested environment, causing a two-year delay. In Desert Storm, E-3s flew 379 missions and helped with 38 of 41 coalition air-to-air kills. On March 27, 2026, an Iranian drone and cruise missile strike on Prince Sultan Air Base in Saudi Arabia destroyed one E-3G and reportedly damaged another.

• In 1995 an E-3 leaving Elmendorf Air Force Base in Alaska ingested Canada geese into both left engines and crashed, killing all 24 crew.
• Mission crews of roughly 14 to 19 people work up to 14-hour sorties in a cold, windowless cabin.
• The Air Force planned to buy the 737-based E-7 Wedgetail, dropped it in 2025 for space-based radar and the E-2D, then moved to save it in May 2026.
• Britain retired its last E-3Ds in 2021 and sold airframes to Chile for spare parts.
• NATO and France are looking at smaller platforms such as Saab’s GlobalEye on a Bombardier business jet.