World's Most Massive and Costly Military Aircraft Ever Built

9. Sentry E-3G

Entered Service in 1972 Retired 1992–1997 (G upgraded in 2015) Cost: $270 million The E-3 Sentry is an airborne early warning and control aircraft, often referred to as AWACS. Developed by Boeing, it is based on the 707 aircraft. The Sentry has been used by NATO, the USAF, the RAF, the FAF, and the RSAF. Its distinctive rotating radar dome makes it easily recognizable.

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Twitter.com/E-3G Sentry @JetPhotos A total of 68 units were produced, with the E-3G being the latest model. The upgrade for the USAF Block 40/45 includes enhanced technology and software, improving computer processing, communications, threat tracking, and automating tasks that were traditionally manual.