Flight to STL was delayed 30 minutes--which meant 30 minutes less of 60 degree weather!
Took the Metrolink light rail downtown and across the river to the first station in Illinois. Then walked back to Missouri and the Gateway Arch. Took pics but battery ran out. I am getting one of those external batteries---a smartphone used all day just doesn't last, and to travel light I had no additional camera.
I decided to cut it closer by arriving to the airport 1 hr before my flight (instead of 1 hr 20 min). I was walking from the Arch to Union Station but I wasn't going to make it so go on at 8th and Pine.
Used the priority security line and all was well. A bonus: my Detroit gates were th same for arriving and departing!