[wongarsu]

If passenger density was comparable to a typical airliner, an intercontinental E2E flight should be roughly comparable to a subsonic flight. The supersonic flight would be substantially worse. Rockets have the advantage that they very rapidly get out of the dense part of the atmosphere.

In reality a Starship flight would probably sell few very expensive seats instead; just like Boom's aircraft only has 50 seats. Which would make it worse than subsonic flights in terms of fuel used, but still competitive with supersonic.

[cnlevy]

Starship's payload volume is around 1000 m ^3, which should be about the same as an A380 interior volume.

For a flight time between 20 (minimum) and 40 minutes (maximum) to anywhere on earth, this volume could comfortably fit 1000 passengers per flight.

At 2 or 3 times the price of a regular ticket, their offer would be a direct competitor against business class tickets, if they can reduce enough the risk, and handle logistics of rapid reuse.