Douglas YA4D-1 Skyhawk Bu. No. 137820, 500km speed record at Edwards AFB, 15 October 1955 Published on August 3, 2013 in 15 October 1955Full resolution (1873 × 1374) ← Previous Next → Douglas Aircraft Company YA4D-1 Skyhawk, Bu. No. 137820. (Navy Pilot Overseas)