1929 also saw the first flight of by far the largest plane ever built until then: the Dornier Do X with a wing span of 48 m.
Only five years after the German Dornier Do-X had flown, Tupolev designed the largest aircraft of the 1930s era, the Maksim Gorky in the Soviet Union by 1934, as the largest aircraft ever built using the Junkers methods of metal aircraft construction.