I've got a question: to what extent can they dish up the "Terms of Service" argument? That is, can they refuse to fly you (domestic) if you refuse to comply bec

I've got a question: to what extent can they dish up the "Terms of Service" argument? That is, can they refuse to fly you (domestic) if you refuse to comply because it's a "term of service"? Is there any niddling contract law in purchasing plane tickets?