When I was flying home from WDW in 2009 on Delta, I don't know if it was the type of plane I was on or what but without the seat in front of me being reclined it was already hitting my knees and the tray could not come down all of the way. The lady sitting in that seat kept ramming her seat back, into my knees and if I tried to use the tray also right into my stomach. I am 5'6" and at that time weighed about 220 pounds.. so not tiny but not some overly large person. She came within a hair of getting decked in the face and I gladly would have served the jail time. A 5 hour flight with someone repeatedly hitting you with a chair, and having made sure to say out loud that there was not room for them to recline and that the chair was striking me, took every last fiber of my patience. So no, I do not recline unless there is no one behind me. I am conscious of my surroundings at all times whether it be on a plane, in my car, in a walk way at a grocery store and I think the rest of the world needs to do more of it. I had flown Delta many other times and had never ran into this before, even at times I was larger so I think it must have been the plane I was on. In January we fly southwest and I am 60 pounds lighter than our last trip so I hope that helps because I would really hate to spend a few days in jail.