I wasn't aware I had booked an economy flight when I finalized my reservations. Upon trying to do a seat selection I found info on the American site that I couldn't select a seat or had no overhead bin space. I was concerned but since I couldn't change it I decided to make it work. And it did! At check-in American assigned me a seat and they were fine. My bag fit easily under the seat and I didn't feel like the economy thing was an issue at all. Good flight. On time. Friendly people. Good snack. It was just fine.