In service from 1986 to 2000.
In service from 1976 to 2000.
In service from 1979 to 2000.
In service from 1981 to 2000.
Few of Mig21 UMs are still flying as training aircrafts in Vietnam People's Airfoces. One of them was crushed during a training mission late 2009 (in Yen Bai), which sadly killed two pillots.
19 December 2003 the Mig-21 UM made the last flight.This was also the last flight of this aircraft type in Poland.