An Envoy Embraer ERJ-175 on behalf of American Airlines, registration N226NN performing flight AA-3880 from El Paso,TX to Chicago O'Hare,IL (USA), was descending through about FL160 when the aircraft encountered turbulence causing injuries to a flight attendant. The aircraft continued for a safe landing on Chicago's runway 27L about 15 minutes later.
The FAA reported the flight attendant received serious injuries, the occurrence was rated an accident.