I have also sat in airline seats in which the person next to me has needed a seat belt extender and has attempted to lift the armrest on the seats. I say attempted, because I do not allow the armrest to be raised for obvious reasons. I have paid for my entire seat, and I don't want to share it.
boy, this is a tough subject for me. i have struggled with weight my whole adult life. when I met hubby , I was about 10 pounds over weight. now I am about 30 (40?)pounds over. depends if you ask him or me!

I am 5'8" and weigh about 190. when we divorced, I got down to about 145. I only ate one meal in the middle of the day. and lots of veggies, etc.. now that we are Remarried , he is a meat and potato man. we eat our meal in front of the TV (watch a movie, etc) later at night, then go to bed. BAD> BAD. and he HATES veggies, so I make meatlaof and mashed potatos, etc. NO incentive to make ""healthful" meals.
and. believe me, he hates that I was chunky(ok, FAT, 200) when we split up, lost tons of weight when we were apart, then gained weight after we remarried. (like it was a conspiracy!

) we got back together after a trip to disney, and I looked REALLY GOOD in that bathing suit!

and, I did gain a lot of weight back after we remarried. (that was NOT the reason for our breakup AT ALL!) true, I HATE exercising!!!! I admit it! I DID suggest we buy bicylces (since we live about 4 blocks away from a beautiful bike path along a river), but they're pricey, and there's no where to keep them in a town house. (as you can tell, I TOTALLY understand "weight" issues)
wow! am I getting off track here! I guess my point here is I KNOW how hard it can be to lose weight. I should make corn dogs and french fries for him, and chicken breast with asparagus for me?
I TOTALY commiserate(?) with overweight people... really.
but, I also have a stupid claustrophobia thing on airplanes. I have obese friends (like 300 pounds or more). just like there is a weight limit on the SEGWAY tours at disney, and at Cedar Point in Ohio, "tryout seats" for the roller coasters, there ARE certain limitations. NOT discriminatory, just based on physical limitations.
sorry to offend anyone, but I REALLY, REALLY want my WHOLE seat on an airplane. I paid for it. and I want an arm rest. the last time we flew, I had HALF a seat.
I paid for a WHOLE seat. and flying makes me TOTALLY claustrophobic.
we went to a concert, and I paid just as much as the 300+ pound man next to me, but I did NOT enjoy the $60 concert ticket I paid for cause I really didn't have a SEAT! by the end of the concert, I was SO cramped, I was literally in pain. there was NO room for my legs, I was practically sitting on hubby's lap! I kept PRAYING for intermission! my $60 seat was wasted.
now, is it discriminatory (or politically incorrect?) for me to expect to enjoy the concert? (that I PAID for?) or the same on the airplane. should I have said, "ok, you have 'special needs' because you are overweight (and I understand your plight) so I'll just make due with HALF a seat, when I am claustrophobic already?
I really don't care WHY you weigh that much. I'm SURE you are a very nice person and have struggled with weight issues all your life. maybe it is a medical issue. I have NO predjudice against you. BUT, I STILL want the WHOLE seat I PAID for.