Japanese F-35 fighter jet disappeared from radar during a flight exercise over pacific ocean off the eastern coast of Aomori on 9 April at 19:27 local time.
The country’s defence force said the stealth jet, an Lockheed Martin F-35A model, disappeared from radar about half an hour after taking off from the Misawa air base with three other F-35As for a flight exercise.
Japan is one of the few nations, along with Israel, in possession of the American-made advanced stealth fighter jet.
Following the incident, 12 other F-35s from the Misawa base were grounded.
Japan plans to buy 147 Lockheed-Martin-made F-35s, including 105 F-35A conventional take-off and landing variants and 42 F-35B short take-off and vertical landing aircraft, over the next decade.
The highly advanced fifth-generation F-35 fighter jet has the ability to connect its systems with other aircraft and form an information-sharing network.