I fly a lot in the fall and spring. (Yes, like a migrating monarch butterfly, which is probably what you were thinking.)
A few weeks ago, while at the Nashville airport, I walked up to the security line.
There were three lines open for the station where the guy checks your ID and your boarding pass. The one on the left had 25 people in it. The one in the middle had 25 people in it. The one on the right? It was empty.
Nobody was in the one on the right, which I thought was weird.