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760px-Boeing C-135C 61-2669 Speckled Trout

A Boeing C-135C "Speckled Trout" of the USAF.

The Boeing C-135 Stratolifter is a military transport aircraft of the United States Air Force (USAF) that was based on the Boeing 367-80 transport airliner prototype.

Many variants of the C-135 have been built during its service time. The only variants that were built from factory were the tanker aircraft KC-135A and KC-135B, the RC-135A and -B, as well as the C-135A, -B and -F. The other variants, such as the EC-135, OC-135, WC-135 and many others, are the result of upgrade programs.

They were given the internal designation '717' by Boeing; a designation now taken by the Boeing 717 inherited after the McDonnell Douglas merger. The type differs from the similarly designed Boeing 707, also derived from the 367-80, by inheriting a narrower 5-abreast fuselage.