If 19A is the seat I'm thinking of then the emergency slide box is a big deal. I had this seat on a flight from ATL-BOG and after sitting there for 30 sec I decided there was no way I was going sit in this seat for 5 hours. Basically, the slide box seems like its in your lap and you have to angle your feet into the space of the person next to you. Maybe if you are a small person, its not an issue but when I first boarded, I was in disbelief that anybody could sit in the seat.

Anyway, I was able to switch to another seat before we left ATL.