The G550 might link Washington with Dubai, but not
always Dubai with Washington.
The
PR man forgot to mention the tail wind advantage TO Dubai. Fuel load, and passenger loads.
7300 nm is a record attempt range, not daily expected range....
Try 6200 nm, NBAA much more predicatable.
The seats in the G450 are much better, as you say than the G4, with more legroom, and importantly elbow room.
The coffee cup holder is reachable, not like the G4.
The crew rest are in the G550 can be a joke. Its only function in life is an extra larder for the catering, better than the toilet.
I have never managed to sleep in a G5 or G550 crew rest area. Noisy from the Galley. Crew talk, flight deck noises, inc normal level talk. Passenger entertainment systems, and doors closing.
I almost forgot, galley aromas....some good some bad.
The G650 crew rest area promises to be usable. Unless the Big Cheese sees it as (his) office space......YOU HAVE BEEN WARNED....
glf