It would make a hell of a tanker.
You can increase speed without going sonic! The U-2 flew at over 700 MPH. This would decrease travel time by 30 percent.
With the government setting a minimum pitch of say 31 inches no airline could try to gain an edge at the discomfort of it;s passengers.
Well what do you think has been going on the last seven years?
Why not go ahead clean sheet, with the oval body they have talked about? Use a 2-4-2 seating, short flights could be turned around much faster than they are now.