A. As I discovered when I took the British Aiways safety course in London the overwing doors on a Boeing 737 are heavy! Forty pounds to be exact, and I was surprised how difficult they are to operate (tip: if you ever have to open one, sit well back in your seat because the door will hit you as it opens into the cabin, and it will hurt!).  And while the chances of ever having to operate one are miniscule, you were right to ask to be reseated. Overwing exit rows are considered to be a "perk" and some airlines only assign them to their best customers for free or charge extra for them. Next time you fly, look at a seat map at Seatguru.com to see if you're sitting in one of these rows (they're clearly marked). Most airlines ask you if you're capable of sitting in these rows when you request these seats, but there is a chance that you'll be assigned one at random at the last minute if no other passengers grab one.