If you're going to choose an aisle seat, a center-section aisle makes much more sense than the aisle seats that are adjacent to window seats:

- When the person next to you needs to get out, there's a 100% chance that you'll be stepped over if you're in the 2-seat section. But if you're in the 3-seat section, it's about a 50% chance that you'll be the stepped-overee.

- If there's an empty seat in the cabin, it's far more likely to be the center seat in the 3-section than the window seat.