History's Largest and Most Expensive Military Aircraft Ever Built

5. Fighter Bf 109

Joined the Service in 1935 1945 saw retirement Price: *$1.5 million The Bf 109 is considered a relic of aviation history. Used by the Luftwaffe and Royal Romanian Air Force during WWII, the Bf 109 was one of the most advanced planes of its time, operated by the Axis powers. Bf-109 Fighter on Pinterest / @tjoleary3 Featuring cutting-edge technology, including an all-metal design, closed canopy, retractable landing gear, and a liquid-cooled inverted V12 aero engine, the Bf 109 competed with American aircraft like those from Boeing. Allied forces referred to it as the "Me 109."

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