>See https://www.jacobinmag.com/2017/04/united-airlines-video-pas.... for why United had every right to remove the customer.

I don't see anything compelling there. The only somewhat legal word is "property rights".

It doesn't mention the "common carrier laws" that may be involved here, and likely override any "property rights." I suspect we'll see more enlightened debate soon as aviation attorneys start talking about it.