World's Most Massive and Costly Military Aircraft Ever Built

12. Talon T-38C

Entered Service in 1959 Not retired: N/A Total cost: $756 million The T-38 Talon is a two-seat, supersonic jet trainer with twin engines. It holds the record for the largest production number of any jet of its type and was the world's first supersonic jet trainer. The T-38C is an upgraded version of the T-38A, featuring structural and avionics improvements.

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T-38C Talon via Twitter.com / @kadonkey Initially known as the N-102 Fang, the project was designed by Northrop Grumman. After rejecting an initial engine design from General Electric for being too large and costly, Northrop developed a smaller engine, leading to the successful design of the Talon.