Editing Convair XC-99 (section)

==Design and development==
Design capacity of the XC-99 was {{convert|100000|lb|kg|abbr=on|-3}} of cargo or 400 fully equipped soldiers on its [[double-deck aircraft|double cargo decks]]. A cargo lift was installed for easier loading. The engines face rearward in a [[pusher configuration]].

===Planned civil passenger variant===
The Convair Model 37 was a large civil passenger design derived from the XC-99 but was never built. The Model 37 was to be of similar proportions to the XC-99; {{convert|182|ft|6|in|m|abbr=on}} length, {{convert|230|ft|m|abbr=on}} wingspan, and a high-capacity, double-deck fuselage. The projected passenger load was to be 204, with an effective range of {{convert|4200|mi|km|abbr=on}}.

Fifteen aircraft were ordered by [[Pan American Airways]] for transatlantic service. However, the fuel and oil consumption of the six {{convert|3500|hp|kW|abbr=on}} Wasp Major radials powering the XC-99 and B-36 meant that the design was not economically viable, and the hoped-for [[turboprop]] powerplants did not materialize fast enough. The low number of orders was not sufficient to initiate production, and the project was abandoned.