this is from wikipedia.
this is my favourite part.
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Superior US pilot training versus Korean and Chinese training accounted for some of the US success in the air war with a
reported kill ratio of 14 to 1 by the Air Force in MiG Alley. MiG Alley was a hotbed for air-to-air combat near the Yalu River between the boundaries of Korea and China. Early sources attribute the F-86's all-moving tailplane to giving the Sabre a decisive advantage over the MiG-15. However, this claim has since been downplayed.
Review of recently released Soviet documents that had been classified top secret until the fall of the Soviet Union shows that the American pilots claimed to shoot down more than twice the number of MiG-15s than ever served in Korea, though discounting these extra kills the kill record would still be in the Sabre's favour.
The disparity between Soviet and American accounts of the air war is startling. Neither side's loss records can confirm the majority of the victories claimed by the other side. Many of the air engagements reported can actually be corroborated by both sides, but then each would claim several victories and neither would show any losses.
Soviet sources claim a very favorable kill ratio: over 1,300 MiG-15 victories against only 345 MiGs lost. It should also be noted this figure includes aircraft other than fighters, such as bombers.