One of the most important advanced pilot trainers of WWII was the North American AT-6. The aircraft was so popular and well liked, it was used by several branches of military during the war. 

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The AT-6 was originally built by North American Aviation and features a 600 HP Pratt & Whitney R-1340-AN1 radial engine, a variable-pitch propeller and retractable main landing gear. It also could be fitted with machine guns and bomb racks for use in gunnery and attack training.​

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A much more advanced and challenging airplane than the BT-13, pilots who earned their wings on this great aircraft went on to learn how to fly the fighter or bomber that they would likely see combat with.