One version of the MiG-31, the “D” model, was being developed as an anti-satellite aircraft,<ref>''The World’s Great Fighters: From 1914 to the Present Day'', by Robert Jackson, Amber Books, 2005</ref> but this project was cancelled after two prototypes were built.<ref>[http://www.aeroflight.co.uk/types/russia/mig/mig-31/mig-31.htm Mikoyan Mig-31 Foxhound]</ref> | One version of the MiG-31, the “D” model, was being developed as an anti-satellite aircraft,<ref>''The World’s Great Fighters: From 1914 to the Present Day'', by Robert Jackson, Amber Books, 2005</ref> but this project was cancelled after two prototypes were built.<ref>[http://www.aeroflight.co.uk/types/russia/mig/mig-31/mig-31.htm Mikoyan Mig-31 Foxhound]</ref> |