Hi,

how close do you think I'd be cutting it to transfer from a United Express flight that gets in 3:10 PM to an American Airlines international flight that leaves at 5:10 PM (London in business class, if it matters)?

It just makes the minimum connection time, but is this really pushing it?

If I do make this transfer, is the automated train my best bet?

Thanks!

Given where the UX gates have moved to, its plenty of time (so long as you are reasonably on time) and very walkable.

Assuming your flights are on time, this is doable. I would not take the airport train - you will be arriving in terminal 2 and most likely your flight leaves from terminal 3, just follow the signs to terminal 3. You will walk just as far to get to the airport train and then have to wait for a train.

Did you make your flight?