A pilot's medical emergency caused an American Airlines plane to make an unexpected landing in St. Louis on its way from O'Hare International Airport to Dallas this morning.
Officials did not yet know what caused the first officer on the MD-80 to become ill after the aircraft took off from Chicago at 9:53 a.m.
A second pilot in the cockpit took over from the first officer and landed the plane at Lambert-St. Louis International Airport at 10:51 a.m.
The pilot was taken off the plane by paramedics and transported to a hospital.
There were 140 passengers and five crew members aboard American Airlines Flight 2309. A new cockpit crew was substituted in St. Louis. and the flight was expected to arrive at Dallas/Fort Worth International Airport by 1:37 p.m.