History's Largest and Most Expensive Military Aircraft Ever Built

MosaicHarbor Updated 2025-07-24

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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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About the Author: MosaicHarbor

I write to help you move from passive reading to intentional improvement.

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Comments

EmberAnchor 09/30/2025

Softens adoption inertia.
CircuitSkies 09/14/2025

Prototype-worthy concept.
QuantumNomad 09/20/2025

Strong pulse—where next?