I know that many will say " all people have a right to fly etc etc" and with that I do not disagree.... However, when I fly, especially on holidays, I like the excitement that the whole experience of traveling can give you, and if I am in an economy seat ( something I do try to avoid, if I possibly can ) then I must say, that when a person of larger proportions is coming down the aisle towards me.....I do hope that they do not sit next to me. I totally think it is unfair that they sit in their seat and half mine as well !!
Sometimes we are not talking about a quick bus ride, or public place. It can be for a 8 plus hour length of time.
i once had a flight from Honolulu to Sydney, and the lady beside me was half into my seat as well, then when the passenger in front reclined their seat, I was totally trapped........for the entire flight. Im probably sticking my neck out here, but i think if you cannot fit in an economy seat comfortably, and you are sitting next to a stranger, then yes, there should be a way of creating some space, and if this means buying a comfort seat, then so it should be...