Likely (but unconfirmed) a C2-A Greyhound as depicted here
The crash, which took place southeast of Okinawa, Japan, happened at 2:45 p.m. local time, which is 12:45 a.m. ET.
The USS Ronald Reagan is conducting search and rescue operations, the Navy said. Conditions of the 11 passengers is not known. The cause of the crash is also unknown.
The USS Ronald Reagan is currently operating in the Philippine Sea. The ship was taking part in Annual Exercise 2017 (AE17), a bilateral field-training exercise with the Japanese Navy conducted in waters off Japan from Nov. 16 to 26.
It is one of three carriers currently operating in the area, along with the USS Nimitz and USS Theodore Roosevelt. They took part in a military exercise a little over a week ago as a show of strength toward North Korea.