https://en.wikipedia.org/wiki/Aurora_D8
but it dont looks having much sense
twin tail can be used as noise shield for unducted fun only,
so, it will be fun to imagine future planes in 3 different categories:
1) common planes with very big engines.
1a) will it be DC-9 style return?

(i dont hink V-tail useful for pax)
or
1b) just A380-style gull-shaped wing?
1c) up-on-wing variants

(blended wing not an option)
or something else?
2) unducted fun

current ideas is to use tail structure around fun as noise shield (Aurora D8 and other models (cant find now))
is there possible to invent well-CFRP unducted fun with low noise and no sonic boom?
3) unusual planes

this boeing picture looking for me as common biplane/strut monoplane with combination of disadvantages
but this backed to 2010
https://www.nasa.gov/topics/aeronautics ... lanes.html
and still here
https://www.airlineratings.com/news/boe ... ng-design/
joined wing seems no useful too.
i am personaly prefer triplane (avanty) layout with one big prop between tales plus one common jet engine for takeoff and backup
full or almost-full electro planes is too different on topic imho.
whats is top on the line now?