I once saw a grown man chuck a tantrum on a plane. We were flying from New York to Seoul (and then on to Sydney), and we had just boarded the plane.
As soon as he realised the economy class cabin was very full, he stood up in his chair and pressed the call button. A flight attendant came down the aisle, dodging passengers trying to get to their seats.
She asked him how she could help and he demanded an upgrade.
“I’m sorry I can’t do that,” she replied politely.
From there, things just escalated as he ranted about how he wanted an upgrade because he couldn’t possibly fit in his seat. She continued to refuse. He eventually began offering to pay and she again had to refuse, explaining other classes were all full.
It was a real spectacle, and it ended with us being delayed an hour while the airline located the man’s luggage so they could take him off the flight (something he had asked for).
I was very glad he left, because I can’t even imagine how he might have behaved if at some point in the 12-plus-hours-long flight the person in front of him had wanted to recline.
I’m not very tall. And what little height I do have is all in my torso, so my legs are pretty short. That makes air travel a lot less of a hassle for me.
I don’t care about being in the exit row (in fact I prefer not to be), I don’t ever obsess about an upgrade, and even on those very long flights to places like London and New York, I am for the most part able to make myself comparatively comfortable.