 These were flown by under-trained and inexperienced pilots.After the United States and its closest allies committed its air units to the UN, the North Korean People's Army Air Force (KPAAF) was rapidly depleted.For several months, propeller-engined bombers and fighters, like the B-29 and P-51 Mustang – and early jet fighters like the F-80 Shooting Star, F-84 Thunderjet and Grumman F9F Panther – flew the skies over Korea virtually unopposed.