World's Most Massive and Costly Military Aircraft Ever Built

10. Galaxy C-5M

Entered Service in 1998 Not retired: N/A Cost: $224.29 million The C-5M Galaxy is an upgraded version of the massive transport aircraft originally designed by Lockheed and later maintained by Lockheed-Martin. The development of the Galaxy faced numerous challenges, including budget constraints and structural issues like wing cracks.

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C-5M Galaxy / Twitter.com / @kadonkey Introduced in 1998, the C-5M Super Galaxy features modernized avionics, new engines, and an extended service life expected to last beyond 2040. Initially acquired by the USAF, the Galaxy has supported American military operations since 1969.