Originally Posted by RustyC
I think sneaking into first class (for purposes of sitting there, rather than using the bathroom) has been successfully prosecuted as theft-of-services. Most people wouldn't go for that.
Do you have any sources for the statement about successfully prosecuting ppl who "illegally" sneak into F? I did a couple Google searches for ("theft of services" "first class") and ("theft of services" airline) - and was not able to find any examples. I would be interested to read any courts' findings you could cite.