Loaded handguns have been found at every major airport this past week in Tennessee, including Tri-Cities Regional Airport. According to the Transportation Security Administration, between April 20-27, agents discovered loaded firearms at security checkpoints in every major airport in Tennessee. On Monday, a loaded .45 caliber revolver was discovered at Tri Cities Regional Aiport. While firearms may be transported in checked baggage, provided they are declared to the airline, in a proper carrying case and unloaded, they are prohibited in carry-on bags.