North American P-51 Mustang
North American A-36 Apache
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The Mustang was originally a North American design made to a British
specification. The first Mustangs (and their attack derivative, the A-36 Apache) were limited
to low altitudes due to their Allison engine. It was the installation of the
British Merlin engine that turned the Mustang into arguably the best all-round
fighter of WWII.
The Mustang again saw action in Korea as a
ground-attack aircraft. Almost 15,000 were produced.