The Caddy of all business jets, Gulfstream G550. The pic is the Navy version C-37B. The Navy only operates three of them for Executive Transport out of Andrews Air Force Base. They also operate two GIII's. How do I know? I used to work there.

I didn't fly them, just maintained them. I did ride in our G550's and GIII's a few times though.
Cruise... 6750 mile range going Mach .85 @ 51,000 feet. Pilots have one legged it from Japan to Andrews and Andrews to the Middle east. Makes for a long day of flying.