> But trespassing on someone's property after receiving a request from them to leave is a crime. I am not a lawyer, but I don't think it is that simple. 25 CFR

> But trespassing on someone's property after receiving a request from them to leave is a crime. I am not a lawyer, but I don't think it is that simple. 25 CFR 11.411 - Criminal trespass requires the person comitting the offense to "know that he or she is not licensed or privileged to" enter or remain [1]. What if you believe that you are "licensed or privileged" to do remain where you are, because you are in posession of a valid ticket and the demand that you to give up your seat is not consistent with the terms attached to the ticket? It seems that if you believe that you have a license to remain then you are not commiting a crime, even if you are actually mistaken in this belief. Illinois state law also has a "Criminal trespass to vehicles" offense, but it applies only to entering, not remaining [2]. [1]: https://www.law.cornell.edu/cfr/text/25/11.411 https://www.law.cornell.edu/cfr/text/25/11.411 [2]: http://www.ilga.gov/legislation/ilcs/documents/072000050K21-2.htm http://www.ilga.gov/legislation/ilcs/documents/072000050K21-...