That is the catch. You can't lawfully possess a hand gun in NJ unless you jump through their hoops and get the necessary NJ documents. It's a fair bet that he would be arrested and charged upon taking possession of his handgun containing luggage after arrival.carry such firearm to any other place where he may lawfully possess and carry such firearm
I would do anything to not fly into NJ or NY now. If going to PA it would be better to go through Avoca (Scranton/WB) or Philly and hope you don't get weather diverted to Newark, Trenton, or Binghamton.
Edit: By the way don't take any hollow point ammo into NJ. As I understand it, each round carrys it's own felony charge for possession.