Douglas XA4D-1 Skyhawk prototype (U.S. Navy Bureau Number 137812 Posted on May 19, 2022 by laststandonzombieisland Leave a comment The Douglas XA4D-1 Skyhawk prototype (U.S. Navy Bureau Number 137812). It first flew on 22 June 1954. (Photo: Douglas Aircraft Co.). Next Return to 2,960 Scooters Can’t Be Wrong