Lockheed L-049 Constellation, NX25600 (XC-69) first flight 9 January 1943 Published on January 6, 2014 in 9 January 1943Full resolution (836 × 454) ← Previous Next → In this photograph of the Lockheed XC-69 prototype, the civil registration numbers, N25600 are clearly visible under the left wing. (Unattributed)