1:52 PM CST, January 1, 2010 ST. LOUIS (AP) — A United Airlines Express flight returned to St. Louis as a precaution because of an unspecified "security concern." United Airlines spokeswoman Megan McCarthy says there were no incidents during the flight, and it redeparted at 9:30 a.m. Friday after the issue was resolved. She says Flight 7445 was headed from Lambert-St. Louis International Airport to Chicago's O'Hare Airport when it was called back by the airline around 8 a.m. McCarthy provided no details about the security issue and referred questions to Go-Jet, the regional carrier that operated the flight. But...