I'm rather small - 5'1 - and a size 6ish, and I find airline seats to be very uncomfortable. Because I'm short, I'm usually the one relegated to the seat in the row that has a hump on the floor. Because of my history of DVT, I have to try to move around as much as possible. When hubby and I travel together, we take the arm rest down between us, so I can kind of cuddle up against him and/or put my legs up on his lap for a while (helps my circulation), but there are airlines where the armrest does NOT go down.
Since a half-full plane wastes money (for the airline), and they have since consolidated the number and frequency of flights per path, it's in their best interest to cram in as many seats as possible. I would gladly pay a nominal fee - say $25-50 - for a seat on a plane that had wider seats and more legroom (and obviously, fewer seats, which is why I would expect a higher charge per seat).
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