The MiG-21 Fishbed followed the series of jets that began with the MiG-15. It possessed the same characteristics as its predecessors. It was small, agile, and fast. Its maximum speed was 1,385 mph, range was 981 miles, and service ceiling was 62,335 ft. It was also a simple aircraft, making it reliable and easy to maintain. These attributes combined to make the MiG-21 the most-produced supersonic aircraft in aviation history with over 11,400 manufactured worldwide. It has seen service in over 45 countries across Eastern Europe, Asia, Africa and South America. Some countries are still flying the MiG-21. Many variants were produced between 1959, when it was first introduced, and 1985, when production ended. The subject of this review is the MiG-21MF/MFN – "M" for "modernized", "F" for "upgraded engines", and "N" is the Czech Air Force designation for MiG-21MF upgraded with NATO standard avionics.