That is an American flying Boat. Done quite a few years earlier. Howard Hughes was in the cockpit when that picture was taken. The world had to wait for the 747 to get an airplane with larger proportions.
I visited the museum where that is stored. Largest radial engines ever made.
The government should have bought a hundred of them and really opened up the Alaskan interior. You probably know of the political trials at the time, Howard finished paying for the construction of that one himself.