Ok. I think I have identified the flight carrying Michael White back to the us. A Gulfstream 5 flew down from Ramstein to Zurich earlier and now has departed and is out over the Atlantic at this time. Watch on ADS-B to have a call sign BAXTR95 show up once it is within range ADS-B Exchange network receivers on the US east coast.
https://flightaware.com/live/flight/BAXTR95/history/20200604/1519Z/ETAR/LSZH
https://flightaware.com/live/flight/BAXTR95/history/20200604/2051Z/LSZH