C-131

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C-131 stands in the designation system of the United States Air Force (USAF) valid from 1948 to 1962 for the following twin-engine propeller - driven transport aircraft made by the American manufacturer Convair :

C-131A for the military version of the Convair CV-240
C-131B for military versions of the Convair CV-340
YC-131C for two military test copies of the Convair CV-340 with turboprop drive
C-131D for military versions of Convair CV-340 and six Convair CV-440
C-131E for military versions of the Convair CV-440 .