If the super-rich are in that much of a hurry to get from london to newyork that they will pay the ticket prices needed to sustain such an aircraft, I have a better idea.  Build some mercury capsules.  Stick them and a solid upper stage atop a one-engine version of a SpaceX booster.  For what, 40K worth of fuel and upper stage (?) billionaires can now fly solo to NY in minutes, experiencing all the majesty of vomiting in zero G.<p>Think of what suborbital, zero-G, would be like in a plane with 100 passengers.  Given the forces involved I cannot see suborbital transport ever replacing first class seats on BA.