I fly charter jets. Believe it or not, though, I made better time than the airlines between L.A. and Vegas back in my Mooney (single engine piston, 4 seater) days. Here's what I mean: If you factor in the mandatory advance check-in and security process, or even just a substantial part of it, and the usual gate delays (once had gate delays at each end of an LAX-Vegas flight that pretty much equaled the flight time--there was no available gate on arrival; and took forever to push back on departure) made better time between Santa Monica and Vegas in the Mooney than between LAX and Vegas in the airliner. If you add baggage claim, forget about it. That's total time. Having your car next to the plane's tie-down in Santa Monica, etc. No advance check-in (can do weather and flight-planning from home), etc. So, point is, on shorter trips using airports smaller and less busier than, say, LAX, you can use a slower aircraft but more than make up the difference in total time. I fly the charter jets now. So, we can still use less busy airports if available, drive the cars up to the plane, no real advance check-in for the passengers, etc. As far as just the airspeed, many private/charter jets cruise as fast or faster than the airliners. Most of the mid-size and large cabin private jets (the Cessna Citation X, of course, and others) ; some of the light jets. I've had to slow down when in trail of airline traffic in a couple of the jets I fly. We certainly can fly higher than most of them.