A man is facing charges after TSA officers found a handgun at the Pittsburgh International Airport. Allegheny County Police say the gun was found in a backpack at the airport’s main security checkpoint at 12:15 p.m. on Friday. Police say the backpack belonged to Robert Stalter, 49, from Bethel Park. Officers say Stalter had an expired concealed carry permit. He faces one misdemeanor charge of carrying a firearm without a license. The FBI was notified of the incident. Passengers who bring guns into the airport can face federal fines up to $10,000.