The Mitsubishi X-2 Shinshin (formerly the ATD-X) is a Japanese experimental aircraft for testing advanced stealth fighter aircraft technologies. It is being developed by the Japanese Ministry of Defense Technical Research and Development Institute (TRDI) for research purposes. The main contractor of the project is Mitsubishi Heavy Industries. Many consider this aircraft to be Japan's first domestically made stealth fighter. ATD-X is an acronym for "Advanced Technology Demonstrator – X". The aircraft is widely known in Japan as Shinshin (心神, meaning "one’s mind" or "Mount Fuji")^[2][3] although the name itself is an early code name within the Japan Self-Defense Forces and is not officially in use.^[4][5][6] The aircraft's first flight was on 22 April 2016.