History's Largest and Most Expensive Military Aircraft Ever Built

9. Sentry E-3G

Commenced to Serve: 1972 1992–1997 (G upgraded in 2015)–retired Expense: *$270 million The E-3 Sentry, developed by Boeing, is an airborne early warning and control aircraft. Known as AWACS, it’s based on the 707 aircraft and used by NATO, the USAF, RAF, FAF, and RSAF. Twitter.com/E-3G Sentry @JetPhotos A total of 68 units were produced, with the E-3G being the latest model. The USAF Block 40/45 upgrade improved technology, software, threat tracking, and communications.

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