Hola Glue Ball -
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Yes, Braniff 707-227... 4 or 5 of them, one crashed on tests or delivery.
Braniff wanted extra muscle for hi-altitude operations in South America.
So Boeing offered the JT4A power as option... on the 200.
Was about 15,500 lbs of thrust.
But came the JT3D fans, with 17-18,000 lbs, and fuel economy...
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I think the idea of these engine options came from Douglas DC-8s...
There was the DC8-10, domestic range JT3C, water injection, like 707-100.
Then came the DC8-20, domestic extra power JT4A, like the 707-200.
Douglas offered the oceanic range DC8-30 with JT4A, like the 707-300.
And obviously, the DC8-40 with Conways, like the 707-400...
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Flew the DC8 too, but never these old straight pipes.
I just had a few hours on the DC8-50 fans with JT3D. Not too impressive.
Most of my Diesel-8 flying was on the 60/70 series.
Hated the DC8-61, "a stretched-not too impressive" plane.
But liked the 62/63... and of course the 71/73.
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Never got to fly the 72... Tried to join Aramco after PanAm demise...
But Cargolux gave me a better offer on the 747, then Argentina.
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Happy contrais