Lockheed L-049 Constellation, NX25600 (XC-69), Burbank, 9 January 1943 Published on January 6, 2014 in 9 January 1943Full resolution (749 × 395) ← Previous Next → In this photograph of the Lockheed XC-69 prototype, the civil experimental registration numbers, NX25600 are visible under the left wing. (Unattributed)