Short of this case is, a guy from South Dakota, with a South Dakota permit, takes a gun to New York City. Upon checking his baggage to go back home, he’s arrested, so he’s suing Delta Airlines, suggesting they should know the law and inform him. That’s a bit of a leap for me. You’re responsible for understanding the law. You can’t expect the airline to do that for you. By the same token, can you blame the guy for assuming New York City was part of America?