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* The [[Boeing 707|Boeing 707–220]], which was a 707–120 airframe fitted with more powerful [[Pratt & Whitney JT4A]] engines, civilian versions of the military J75. The 707-220 had extremely high fuel consumption, and only 5 were built, all for [[Braniff International Airways]]. The 707-220 was rendered redundant by the release of the [[turbofan]]-powered 707-120B, which had even greater power along with much lower fuel consumption.
*The [[Convair 880]]. Although Convair only offered one configuration of this aircraft, it had more power and a smaller fuselage than its competitors from Boeing and Douglas. Convair essentially wagered the success of the entire 880 model line on the appeal of an aircraft optimized for hot and high operations. The wager failed; only sixty-five 880s were sold and Convair's nascent airliner business soon collapsed.
*The [[Bombardier Dash 8|De Havilland Canada Dash 8-200]], which is a -100 airframe fitted with larger engines of the -300 for hot and high operations. They proved successful and
* The [[Lockheed L-1011|Lockheed L-1011-200]], which was otherwise an L-1011-100 with more powerful RB.211-524B engines.
* The [[McDonnell Douglas DC-9|McDonnell Douglas DC-9-20]], which combined the smaller fuselage of the DC-9-10 with the larger wings and more powerful engines of the DC-9-30, and was significantly outsold by both.
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