《Su-15 Flagon-A》Developed to replace the Su-11 interceptor during the 1960s,the Sukhoi Su-15 first appeared as a scaled –up version of the Su-9/Su-11 family. But powered by two engines and utilizing twin side inlets which freed up space in the new solid nose for a large radar to insure the Su-15 would fly considerably faster than any known Western aircraft of the time. In addition, the electronics, engines, and armaments were continually upgraded so that the Su-15 remained a formidable high-speed interceptor through the 1980s and guarded the Soviet airspace throughout much of the Cold War. Surely the most notable, albeit infamous, event of the aircraft was involved in 1983 when an Su-15TM’Flagon-F’ shot down a Korean Air Lines Boeing 747 mistaking it for a reconnaissance aircraft. About 700 su-15s remained in service by the mid-1980s, but these were gradually retired and replaced by the MiG-31 and Su-27 by about 1993.