A few destinations do seem to pop-up
1) The UK. Many flights to the several airports. And they don't even need to do England, they could maybe do Scotland. Though Northern Ireland or Wales do seem very unlikely.
2) Dublin, Ireland.
3) Madrid, Spain or Barcelona, Spain
4) Lisbon, Portugal
5) Toronto, Canada
So people don't get confused, this all spec for now, based on the things I explained in the previous post.
Quoting myself, cause. If we cross these destinations, with the information that production does prefer if teams fly direct for final destination. And assuming all the information we've been getting that Detroit is very likely the final city, only 2 possible destinations remain: London and Toronto, all the other cities need flights with at least one stop, to reach Detroit.