Originally Posted by
neilki
A good number of flight crew living in Europe; but no base there.
No doubt about that. Crew members commute to US airlines from all over the world and have as long as I can recall. That's a personal, informal choice.
That's a different situation from an airline establishing a formal crew base outside the USA. And there have certainly been overseas bases for US airlines but they are not numerous and likely rather small.
The link you provided is regarding F/As.
It's difficult to keep up with what all US carriers are doing regarding crew basing.