An Indian Air Force MiG-21 Bison, piloted by Wing Commander Abhinandan Varthaman, shot down a Pakistan Air Force F-16 fighter aircraft and there are eyewitness accounts as well as electronic evidence for it, the Ministry of External Affairs said on Saturday. New Delhi: An Indian Air Force MiG-21 Bison, piloted by Wing Commander Abhinandan Varthaman, shot down a Pakistan Air …