Lockheed built the Orion from its Electra airliner after a 1957 Navy call to replace the P-2 Neptune, shortening the fuselage and adding a bomb bay and a search radar. Up to 11 crew members worked its sensors and weapons, with room left over for a galley and a diner-style booth. Shutting down engines to save fuel, Orions relieved one another in relays to hold contact with a Soviet submarine for days. The Navy ordered about 650, later arming them…