The Mikoyan-Gurevich MiG-15 (Russian: Микоян и Гуревич МиГ-15; NATO reporting name: “Fagot”) was a jet fighter aircraft developed by Mikoyan-Gurevich OKB for the Soviet Union. The MiG-15 was one of the first successful jet fighters to incorporate swept wings to achieve high transonic speeds. In combat over Korea, it outclassed straight-winged jet day fighters which were largely relegated to ground attack roles, and was quickly countered by the similar American swept-wing F-86 Sabre. The MiG-15 is often mentioned, along with the North American F-86 Sabre, as the best fighter aircraft of the Korean War, and among the best fighter aircraft of all time.
When refined into the more advanced MiG-17, the basic design would again surprise the West when it proved effective against supersonic fighters such as the F-105 Thunderchief and McDonnell Douglas F-4 Phantom II in the Vietnam War of the 1960s.
The MiG-15 is believed to have been one of the most widely produced jet aircraft ever made; in excess of 12,000 were manufactured. Licensed foreign production may have raised the production total to over 18,000. The MiG-15 remains in service with the North Korean Air Force as an advanced trainer.
Source: MiG-15bis on Wikipedia
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The MiG-15bis was an improved version of the MiG-15, a jet fighter aircraft developed by Mikoyan-Gurevich for the Soviet Union in the late 1940s. The MiG-15bis had better performance thanks to a more refined production and a slightly more powerful engine. It also had three hardpoints under each wing for carrying weapons and external fuel tanks. It entered service in late 1949 and was widely used in the Korean War, where it proved superior to most Western fighters of the time. The MiG-15bis was one of the most produced jet aircraft in history, with more than 18,000 built in the USSR and under license in other countries.