On Thursday evening, I flew home to LAX from IAD. This was an eventful trip because (1) my upgrade didn't clear, the first time that's happened in several months, and (2) I rode Dulles' new "Aerotrain" for the first time.
A bit of background: Washington Dulles International Airport has three terminal buildings. When you pull up to the airport, you enter the main "Z" terminal. That's where all the ticketing/check-in counters are, where TSA security is, and it's ...