Sailors conduct a preflight check on a P-3C Orion aircraft on the flightline of Naval Air Station North Island in Coronado, Calif., Nov. 1, 2016. The sailors are assigned to Patrol Squadron 46, which is supporting the USS Carl Vinson during a training exercise. Navy photo by Petty Officer 3rd Class Alexander Cole
The Lockheed P-3 Orion is a four-engine turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner.