He can't. The Biz Jet training companies have locations scattered around the world. I work on the side for a 142 training center. A significant number of the pilots I see come from overseas for a three day or four day recurrent. While part 91 just requires a checkride, the FAA is pushing more and more of the transport jet operations into part 125 which requires a checkride and recurrent GS. You want to stay current on a FAA certificate, you have to play by their rules.