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You will have to factor in the 4x associated costs as well (fuel, maintenance , flight crew, airport costs, etc).

I have 0% knowledge on commercial flight OPEX, but at first glance it doesn't sound as simple.

The less time on the ground, more money a company makes.

This probably is true on the air too, granted that you have a similar efficiency and fuel combustion.

Doesn't really work like that. There are substantial dwell times in the cycle that no amount of enroute speed can elimanate...

Unload the passengers

Unload the luggage

Clean the cabin

Load the next set of passengers

Load the luggage

Taxi to the runway...

A supersonic jet is almost certainly going to be (much) smaller than a widebody subsonic passenger aircraft. Furthermore, you probably wouldn't need to make the seating super-luxurious but people paying premium prices are still going to expect at least the level of seating and service you get in domestic US business.