The route schedule needs to be routine, constant and predicable to be of any use for the types of people requiring 4 hour trans-oceanic flights. That means havi

The route schedule needs to be routine, constant and predicable to be of any use for the types of people requiring 4 hour trans-oceanic flights. That means having at least one flight to London each day, and one flight back to NY. Eventually you run out of people willing to pay $10k a seat for this type of travel. Which is what happened to Concorde - after the novelty wore off, all you had was an extremely expensive seat.