 Flying the Wright Apache, Soucek set a series of flight altitude records.On May 8, 1929, he set the world altitude record for landplanes by flying to the height of , and on June 4, he set the altitude record for seaplanes, also in an Apache, reaching the height of .On June 4, 1930, Soucek flew an Apache landplane equipped with a Pratt & Whitney R-1340 radial engine to a height of over Naval Air Station Anacostia, regaining the world record he had held in 1929.