For transpacific flights, first class (or business class, more often) is used by people who would otherwise be on business jets within the US. TBH, first class

For transpacific flights, first class (or business class, more often) is used by people who would otherwise be on business jets within the US. TBH, first class SQ Suites are nicer than any but the best business jets (I've never been on a really luxury jet like a 777 VIP, but I'd take SQ Suites over the G-II or Falcons I've been on). You're basically looking at $250k r/t SF-Beijing to take a Global Express or something. "Normal" business jets won't even get to Hawaii. I think things are different for transatlantic (esp if you're willing to stop somewhere like Canada or Ireland). Business jets make actual sense when you're doing a multi-stop itinerary, lots of last-minute changes, and flying into secondary and tertiary airports. They make a lot less sense for hub to hub intercontinental flights. You could solve all the security issues of intercepting a supersonic aircraft by having a failsafe override (optionally self-destruct). No need to build a Mach 5 interceptor when you can do it at c.