PITTSBURGH — (WPXI) – Transportation Security Administration officers stopped another loaded gun at Pittsburgh International Airport. The third in a week. The agency says it stopped a Georgia man with a loaded 9mm handgun at a security checkpoint Friday. The man now faces a federal financial civil penalty of up to $15,000. Last year, 6,542 firearms were caught at 262 out of 430 airport security checkpoints nationwide. So far this year, TSA has stopped more than 4,000 guns at security checkpoints across the country. At Pittsburgh airport, 33 guns have been stopped.TS