 Fleet allowed it to be used on Consolidated's new twin engine flying boat, the Model 31 XP4Y Corregidor.The Model 31 made its first flight on 5 May 1939, vindicating the Davis wing.By this point Consolidated was already working on a secret project for a new bomber to improve on the Boeing B-17 Flying Fortress that was just entering service, and had selected the Davis wing for this project as well.