05/31/2008. Based on the MiG-21bis the pictured sole prototype MiG-21-93 was first shown in 1993, and incorporates an refurbished airframe fitted with avionics and weapons of the MiG-29. The only known customer for the type is the Indian AF, reportedly 125 of their MiG-21s were to be refurbished (with Russian assistance) by Hindustan Aircraft Limited (HAL) to the new version. Designated MiG-21 Bison, it first flew in June 2001. View also photo 2354.