"Ahh, my son. Many are the mysteries of the Netjets contracts. The biggest one of all being how they get away with it
"
Not a mystery at all actually!
They just devide their crews into several different contracts in different countries and try to keep it as vague as possible, then spread the signing due dates out over one years time period and voila!
In the mean time ignore inputs from crews, ignore requests for clarification, and hand out goodies to some to keep them happy! Ha, dead EASy, isn't it?