American Airlines, other carriers experience technical issues

American Airlines, the dominant carrier at Charlotte Douglas International Airport, was one of multiple U.S. airlines that suffered technical issues Tuesday that caused some customers to experience difficulty checking into their flights.The problem was traced back to Sabre Corp. (NASDAQ: SABR), a Southlake, Texas-based transportation technology company that works with several carriers across the country."Earlier today, Sabre had a brief technical issue that impacted multiple carriers, including&