It depends on the work tour. Sometimes all your flights are international and sometimes all domestic. I'd say probably around half the flying is international currently, but that also fluctuates. The last 15 of so months have been more international than any time in my over 6 years in the Global due to the pent up demand after over a year of almost no international due to covid. If you go on Flight Aware and track any of the N1xxQS tail numbers, you can see where one of the globals has been over the last week or so. You can probably narrow down an individual tail number by looking at arrivals and departure out of KTEB and KHPN to find some 100 series trail numbers to track. It is likely that if you see a tail cross the Atlantic from the US, back to the US, and then back to Europe again within a week, that that was 2 separate crews involved since the typical tour is one week and that includes getting to the airplane and then required rest before the trip and then getting home after the flights. It is uncommon to do more than one flight to Europe and back in a tour.