忽然又想到...
https://www.united.com/web/en-US/co...iage.aspx#sec25
Boarding Priorities - If a flight is Oversold, no one may be denied boarding against his/her will until UA or other carrier personnel first ask for volunteers who will give up their reservations willingly in exchange for compensation as determined by UA. If there are not enough volunteers, other Passengers may be denied boarding involuntarily in accordance with UA’s boarding priority:
真的有權趕乘客下飛機嗎? (行為無不當的乘客)
我以為這裡寫的是，如果沒有自願者，那後來的人不得登機。