A340 is much newer, and is a wide-body, which allows it to carry more passengers.What would be the difference between 707 an A-340s?
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Does anyone have any indications of what the C-135 variant here would have looked like? I've seen concepts on this forum for an air defense version of the C-141, but I imagine a C-135/707 converted to interceptor would look much different.
(Source: Pg. 130, The Aerospace Defense Command and Antibomber Defense 1946-1972, McMullen)