I have a male cousin who is 7'3" and overweight for his height. I can't imagine how uncomfortable he must be on a plane, even if he could afford to be up front. His tallest sister is 6'4" and not overweight for her height, but I'm sure she isn't very comfortable in an airplane seat either.
As I was reading the remarks on this topic, I was wondering what factors go into airline seat size decisions beyond profit. I expect there are none. If they based seat size on average height and/or weight of passengers it might lead to a slight increase, but probably not enough for many. I doubt that using the mode (the most common passenger height and/or weight) would help much either.
If airlines are truly concerned about passenger comfort and safety, perhaps they could take a lesson from medical waiting areas. At least where I go, there are mostly individual chairs with arms. There are some that have higher seat heights. There are some that are 1.5 to 2 times wider. There are some that are both taller and wider.
I expect that having to buy 2 seats and somehow sit in them would be awkward, extremely uncomfortable and not safe. I've noticed from behind them that some people are so tall that the head rest tops out at the base of their neck. That doesn't seem safe either.
Wouldn't it be great if there could be some seats designed especially for the taller and wider among us so they could be both safe and comfortable on their flight? How about some wide enough and designed for parents flying with a child too small to have their own seat? Maybe some wider seats could be designed with the flexibility to be changed for different kinds of passengers?
Now for an opposite scenario. My BFF in Chicago and her mom, V, were going to the west coast to visit relatives V hadn't seen in decades. She hadn't flown in many years, so they got 1st class seats for this special trip. V was quite small and thin. They weren't in the air very long before V requested that they move out of 1st class to smaller seats because her seat was very uncomfortable. Why? It was too big!