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Old 10th Aug 2014, 22:36
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DaveReidUK
 
Join Date: Jan 2008
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'B' was for pure passenger built airframes, and from memory a lighter version.
707 variants with a B or C suffix were turbofan-powered (JT3D).

Variants without a suffix were turbojet-powered (JT3C in the case of the -120; JT4A for the -320).
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