On April 4, 1955, a United Airlines Douglas DC-6 named Mainliner Idaho crashed shortly after taking off from Long Island MacArthur Airport, in Ronkonkoma, Islip, New York, United States. The aircraft, registration number N37512, was performing an instrument rating check flight when it began banking to the right shortly after takeoff. Seconds after climbing past 150 feet (46 m), the aircraft turned through 90 degrees, causing the nose to drop suddenly, before it struck the ground.