Re: Glossing a commercial turd
All that would be needed would be to streamline the airport processes at each end, the flight in the middle would vanish from your life and air travel would be less onerous.
That's what BA did with their Concorde service to New York. There was none of this 3-hour check in, queuing for immigration / baggage / customs nonesense. You saved about 4 to 5 hours airport time as well as 3 hours less in the air. So the door-to-door time was more like 4 to 5 hours, instead of 11 to 12 hours. Pretty big saving.
I think they still do this on their London City - JFK route, but that's subsonic :-(