The Biggest, Most Expensive Military Planes Ever Produced

9. Sentry E-3G

Commenced to Serve: 1972 1992–1997 (G upgraded in 2015)–retired Expense: *$270 million The E-3 Sentry is an airborne early warning and control aircraft, more often known as AWACS. Boeing also designed the 707, from which the Sentry was derived. NATO, the USAF, the RAF, the FAF, and the RSAF have all utilised the Boeing Sentry. The radar dome that revolves above the fuselage of the Sentry makes it easier to identify.

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Twitter.com/E-3G Sentry @JetPhotos There were 68 aircraft produced. The most recent model produced was the E-3G. The upgrade is for USAF Block 40/45. Its technology and software have been updated, improving computer processing, communications, threat tracking, and the automation of traditionally manual tasks like IOC.

10. Galaxy C-5M

Joined the Service in 1998 Not retired: N/A Expense: *$224.29 million The C-5M Galaxy is an improved variant of the Galaxy, a massive transport aircraft designed by Lockheed and maintained and upgraded by Lockheed-Martin, the company's successor. The Galaxy's development was beset by a number of challenges, such as budgetary constraints and wing cracks in the aircraft.

C-5M Galaxy / Twitter.com / @kadonkey Lockheed created the C-5M Super Galaxy in 1998 as a new and enhanced Galaxy. Modernised avionics, new engines, and an anticipated service life beyond 2040 characterise the C-5M. The Galaxy was initially purchased by the USAF, and since 1969, it has supported American forces in every war.