Just a note about the USAF C-54, in the world of civilian aviation, this was the DC-10, the FIRST civilian airplane known as a long-range 4 engine passenger aircraft capable of transcontinental range. It was one of the stars of the 1948-49 Berlin Airlift and an poke-in-the-eye for Soviet Dictator Stalin, who based his thoughts on the capacity of the C-47 / DC-3, an aircraft much less capable.
Postwar Berlin had a population of 2 million people in the French/British/US controlled sections of that city. Support by the WW2 aircraft like the C-47 was impractical and the Potsdam Agreements were agreed to with the unrestricted air-transit agreement based upon that assumption. The added upgrade of the C-54 over the C-47 was that it was a tri-cycle landing gear, which meant that it was a level floor on the ground. The advantages of this in the loading and unloading were immense and under-appreciated. No other Allied plane in use at that time was in quantity to match the C-54 in its throughput.
Good point about the cargo floor vs. the C-47.