Musk and Bezos both have Gulfstream G650. They've been around plenty of aircraft.
https://www.scmp.com/magazines/style/celebrity/article/3167545/inside-elon-musks-us70-million-gulfstream-private-jet
The G650 has 8,600mi range, requires less runway than the super heavies(but 6000ft min), and carries gobs of fuel.
"This, therefore, means that the Gulfstream G650ER is capable of flying from New York to anywhere in North America, South America, Europe, Africa, and most of Asia without needing to refuel."
https://compareprivateplanes.com/articles/embraer-lineage-1000e-vs-gulfstream-g650er
Getting into smaller aircraft, it looks like the Bombardier Challenger 300 is similar to the Citation X in most specs, but beats it in hourly fuel burn.
https://compareprivateplanes.com/articles/cessna-citation-x-vs-bombardier-challenger-300