Before the Second World War, as we have seen, flying boats were at the forefront of trans-oceanic travel.
After the War, it was thought that these luxurious monsters would carry on where they had left off but the development of large bombers, which could be converted to airliners in peacetime, and the increasing numbers of concrete runways spelled the end for the trans-oceanic flying boat.
This picture, from 1946, foresees a future that never happened. There would be giant planes, of course, but not taking off from water.