Don't get stuck in Jersey on a layover with luggage containing a firearm. If the cops find out, you will get arrested.

That very thing happened to a fellow back in 2006. The case against him was eventually overruled, but he did go to jail, had his weapon confiscated, and spent lots of money in legal fees. I don't know if he ever got his gun back, or any of the money he spent defending himself, but that is a hassle I would not want.