I'm a little confused about all this. I'm just trying to score an exit row for a flight from Atlanta to Dusseldorf on March 27. Can I trust Delta's seat map, which shows available C,D and E seats in row 20, the single exit row in what they claim is a 767-200? Or should I assume I will be on a 767-300ER, in which case these seats don't exist, forcing them to give me some random seat at check-in? Or will I be on a 767-400?