Best connection for LHR-SLC?
A year or two ago, I had an LHR-ORD-LAX connection with a 1:40 connection. I decided that was too tight for my personal comfort, so switched to an LAX flight two hours later.
I am a US citizen with Global Entry and TSA Precheck.
On the day of the flight, I zipped through CBP with GE, got on the train, and zipped through TSA as their Precheck line was really short. Once I got into the AA terminal, out of curiosity, I looked up the earlier flight on the monitor. It was "Boarding". Had I been willing to sprint the length of the ORD concourse, theoretically, I might have made the flight.
As it was, I moseyed over to the AC and waited a couple of hours in some comfort.