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TL=8 Hypersonic Flight

It's TL-6.5, mostly.
Fold-down wingtips and underslung engines, riding on the engine inlet shockwave -- these are a straight rip from the North American Aviation XB-70. (Wikipedia)
Flew in 1964.

Not that this is a bad thing, mind you.
320px-North_American_XB-70A_Valkyrie_in_flight_%28cropped%29.jpg


One of the prototypes was destroyed in a collision with a chase plane. Project was cancelled because the paradigm of "fly so fast and high they can't track or hit you" (valid up through the early Jet Age) became obsolete.

Still pretty dang awesome.
 
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Depends on whether they can scale it up to jumbo jet size, economically, and what kind of infrastructure would be needed to support that.
 
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