Some of you on here sound so "entitled". If you want to fly in comfort with more room, then Pay for a ticket in business or first. I'm so sorry that some of you had to sit in (gasp!) coach, but get over yourself and make the most of it. Those seats are blocked just for assignment purposes. Sometimes other passengers have valid reasons to want to change seats (including being in the last row with no recline). At least you had the aisle or window, so stop complaining already. Air travel has become a chore for all of us, not just you.