I just got back from a trip to Colorado. It was the first time I've flown in a year. The concourses were packed at 8PM on a Wednesday night and it was so great to see all the gates filled with plenty of people ready to board. The only thing that really cracked me is up is when we got to Denver. The airport trains were full and I didn't even make the first one. I squeezed in on the second one and we were practically shoulder to shoulder. The PA announcement as the doors were closing was, "Please maintain physical distancing." I really had a laugh about that one.
I looked into getting on an earlier flight on the way back. It was completely full, a 767-400 too.