The cause of crash is unknown and the names those onboard are being withheld while next of kin are notified, the US Navy said in a statement.
The aircraft was en route to the aircraft carrier USS Ronald Reagan in the Philippine Sea.
US military vessels have been involved in a number of accidents in recent months in East Asia.
The US Navy lost 10 personnel in August, when the USS John McCain collided with a tanker near Singapore.
Two months earlier, in June, the USS Fitzgerald smashed into a cargo ship off the coast of Japan, killing seven.
In two other non-fatal incidents, the USS Antietam ran aground near its base in Japan in January, and in May USS Lake Champlain collided with a South Korean fishing vessel.
A US Navy aircraft carrying 11 crew and passengers has crashed into the sea off the coast of Japan
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on
November 22, 2017
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