I've never had any issue flying with one in checked-in luggage from any of the local airports -IAD, DCA, and BWI. Use a hard case, take ammunition out of gun, and use a lock. Ammunition can be inside the same hard case with the gun and magazine; however, the gun must be unloaded. Tell the agent at the ticket counter and they will instruct you on what to do. Some ticket agents are inexperienced, yet they should call someone with experience in such matters.

By the way, do not fly into or through any of the NYC airports with a checked-in gun. They do not honor the federal laws on flying with guns.