''Today morning a MiG-21 trainer aircraft on a routine training mission from Gwalior Airbase crashed near the Airfield at around 1000h,'' an IAF source said.A Court of Inquiry has been constituted to ascertain the cause of the accident.Since 2016, IAF has lost 27 aircrafts, including 15 fighter jets and helicopters in crashes, Ministerof State for Defence Shripad Naik had said in June 2019.(UNI)