High Quality Content by WIKIPEDIA articles! The Curtiss XP-31 Swift (company model XP-934) was a 1930s American experimental monoplane fighter built by Curtiss for the United States Army Air Corps. Although the XP-31 featured the first enclosed cockpit on a U.S. pursuit aircraft, it was also the last pursuit aircraft to have fixed landing gear and externally braced wings. Despite its innovations, the XP-31 did not offer any advantages compared to its rival the Boeing P-26 and was not ordered into series production. Curtiss offered the XP-934 in a 1932 competition with the P-26. It was a low-wing monoplane with fixed, strut-braced landing gear, first flown in July.