A license is by definition revocable. Wrongful revocation may give rise to a breach of contract claim but it is still effective for the purpose of property law.

A license is by definition revocable. Wrongful revocation may give rise to a breach of contract claim but it is still effective for the purpose of property law. They don't need to immediately pay damages in order to make it effective. Failure to vacate following a license revocation, including a wrongful revocation, is trespass. His remedy was in the form of a cause of action against United, not self help in the form of refusing to leave the plane. Many people seem to think this is unjust. I don't necessarily disagree, but there's no need to go around the internet attacking the messengers. If you don't like how the laws work, write your legislators.