TYBs
Reg.:B-99888
Country:ICAO (special)
Up out of Milwaukee International. Interesting, apparently Taiwanese judging by this YT video I found.
https://youtu.be/v6wI8RG9kZ8
Macau according to Flight Aware
B-99888 - Unknown Owner (Macau)
This aircraft (B-99888) is not available for public tracking per request from the owner/operator.
https://flightaware.com/live/flight/B99888
B-99888 "Chairman Guo"'s Gulfstream Aerospace G-V-SP G550 …
鴻海集團 Hai Precision Industry Co., Ltd. (trading as Foxconn) is a Taiwanese multinational electronics manufacturing company headquartered in Tucheng, New Taipei, Taiwan. It is the world's largest maker of electronic components.
https://youtu.be/bSIPMcDdwHs
https://en.wikipedia.org/wiki/Guo_Guangchang
https://en.wikipedia.org/wiki/Macau