The Boeing 377 Stratocruiser was the commercial version of the C-97 Stratofreighter. The two-level 377 was pressurized and could accommodate 50 to 100 passengers. On long flights the aircraft could accommodate 28 upper and lower bunk units. This led to the aircraft being referred to as the “Flying Hotel”. The 377 was larger and could fly further than the Constellation or the DC-6 but the engines and complexity of the aircraft proved to be too costly to operate bringing production to an end in 1950.