At one time I was in supply chain Mgmt and ran a large distribution center which shipped virtually everything via air freight. Air freight rates are calculated utilizing what’s known as the DIM’s factor. It’s a calculation that takes into consideration both weight and deminsions. If weight only were used then it would cost virtually nothing to ship a plane load of potato chips. Conversely, if dimensions only were used it would cost a fortune to ship the same load of potato chips. An extreme example but hopefully you get the idea and thus the logic behind using DIM’s. Anyway, being 6’4” and 250 lbs, I try very hard not to intrude into others space. I’m not fat so I don’t intrude to the left or right. But, I am long legged and sometimes in economy class the person in front of me can tilt their seat as far back as they would like. I would be perfectly happy to pay my fair share for additional space and I usually do by flying business or now the newly introduced premium economy. All I want is a fair deal and get what I pay for. Actually, I live in the Dallas area and if I need to go to perhaps Austin, Houston, anywhere within about 200 miles I just drive as the total elapsed travel time is about the same as flying, sometimes better when driving. That’s it! :)
https://en.m.wikipedia.org/wiki/Dimensional_weight
TSA was when your 200 miles became 2,000 miles for me. I basically don’t fly. 6 foot, 210 lbs. Too uncomfortable. I would rather drive anywhere, see the country, eat some nice meals, in comfort.