I didn’t read all posts but I want to jump in a bit
I believe it’s currently against regulations to purchase more than one seat per person, if not outright illegal
This is due to anti terror stuff. I looked into it when trying to purchase two seats for a heavy traveler and that I. What I was told.
As to spending money to avoid a lav, the chafets Chaim brings that halacha ,though I don’t have the sefer near me now to look up the exact source. He is discussing possible loss of your job due to not speaking L”H and he says it’s not allowed because you must give up all you have, to not be over “just like by every lav where you are required to give up all you own to not be over ”
To the fellow who didn’t like the lying “parole ” trick
You seem to have forgotten.
We are all out on parole.
Our souls come down for a limited freedom where our every action is watched and we will have to give an accounting for everything.
Is that not parole???