 "Plane Crazy" was later given its own synchronized soundtrack and released on March 17, 1929.Mintz, meanwhile, opened his own studio consisting primarily of former Disney employees, where he continued to produce Oswald cartoons, among them the first Oswald with sound, "Hen Fruit" (1929).Coincidentally, Disney and Mintz each produced nine cartoons the first year and 17 the next, before Oswald was taken over by others.