Editing Airliner (section)

====United States====
[[File:6609-UAL-DC-6-NorthRampStapletonDEN.jpg|thumb|[[United Airlines]] [[Douglas DC-6|DC-6]], Stapleton Airport, Denver, September 1966]]
The first batch of the [[Douglas DC-4]]s went to the U.S. Army and Air Forces,{{when|date=December 2020}} and was named the [[Douglas C-54 Skymaster|C-54 Skymaster]]. Some ex-military DC-6s were later converted into airliners, with both passenger and cargo versions flooding the market shortly after the war's end. Douglas also developed a pressurized version of the DC-4, which it designated the [[Douglas DC-6]]. Rival company Lockheed produced the [[Lockheed Constellation|Constellation]], a triple-tailed aircraft with a wider fuselage than the DC-4.

The [[Boeing 377 Stratocruiser]] was based on the [[Boeing C-97 Stratofreighter|C-97 Stratofreighter]] military transport, it had a double deck and a pressurized fuselage.

Convair produced the [[Convair CV-240 family|Convair 240]], a 40-person pressurized airplane; 566 examples flew. Convair later developed the [[Convair CV-240 family|Convair 340]], which was slightly larger and could accommodate between 44 and 52 passengers, of which 311 were produced. The firm also commenced work on the [[Convair Model 37|Convair 37]], a relatively large double-deck airliner that would have served trans[[continent]]al routes; however, the project was abandoned due to a lack of customer demand and its high development costs.{{cn|date=June 2024}}

Rival planes include the [[Martin 2-0-2]] and [[Martin 4-0-4]], but the 2-0-2 had safety concerns and was unpressurized, while the 4-0-4 only sold around 100 units.<ref name="Jarrett">[[Philip Jarrett|Jarrett, Philip]]. eds. Modern Air Transport: Worldwide Air Transport from 1945 to the Present. London: Putnam, 2000.</ref>

During the postwar years, engines became much larger and more powerful, and safety features such as deicing, navigation, and weather information were added to the planes. American planes were allegedly more comfortable and had superior flight decks than those produced in Europe.<ref name="Jarrett"/>{{page needed|date=December 2020}}