Southwest pilot with loaded gun arrested before boarding

St. LOUIS — Authorities have arrested a Southwest Airlines pilot after a loaded 9 mm pistol was found in his carry-on luggage before he boarded his aircraft at St. Louis' Lambert Airport.The airport said in a statement that Transportation Security Administration officers made the discovery early Wednesday.The statement says the 51-year-old pilot didn't have any authorization to carry a firearm on the Las Vegas-bound flight. He was arrested on suspicion of unlawful use of a weapon, and the