World's Most Massive and Costly Military Aircraft Ever Built

5. Fighter Bf 109

Entered Service in 1935 Retired in 1945 Price: $1.5 million The Bf 109 is now considered a relic of aviation history. This fighter aircraft was used by both the Luftwaffe and the Royal Romanian Air Force during World War II. Despite being operated by the Axis powers, the Bf 109 was one of the most advanced planes of its time.

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Bf-109 Fighter on Pinterest / @tjoleary3 The Bf 109 featured cutting-edge technology for its era, including an all-metal monocoque design, closed canopy, retractable landing gear, and a liquid-cooled inverted V12 aero engine. It was designed to compete with American aircraft like those produced by Boeing. Allied forces referred to the Bf 109 as the "Me 109."