On January 16, 2024, American Airlines Flight 2516 experienced severe turbulence during descent over Chicago O’Hare International Airport (ORD). The flight, a regularly scheduled passenger flight from Orlando International Airport (MCO), encountered clear air turbulence, resulting in a significant incident involving a flight attendant and a passenger. The turbulence, which began around FL250, impacted the aircraft and caused a significant delay. The flight crew immediately initiated procedures to ensure passenger safety, including preparing the cabin and informing passengers of the turbulence. While the aircraft remained operational, the turbulence caused a serious injury to a flight attendant. The turbulence intensified as the aircraft descended through FL250, leading to a significant drop in altitude. The flight crew reported the turbulence advisory, and the captain instructed the cabin crew to prepare for landing and seat passengers. The seatbelt sign was activated, and the cabin crew worked to secure the passengers’ safety. The turbulence continued, causing the aircraft to descend through FL250, resulting in significant turbulence impacting the flight. The flight attendant, FA1, sustained injuries while attempting to secure her seatbelts, requiring medical attention. The captain communicated the situation to dispatch, requesting medical personnel to meet the airplane at the gate. After landing, FA4 was transported to the hospital, where she was diagnosed with multiple fractures to her left leg and ankle, requiring surgery. An analysis of weather radar revealed strong horizontal and vertical wind shear and gravity waves in the area, consistent with a favorable environment for clear air turbulence. Preflight weather planning predicted light to moderate turbulence between FL290 and FL360, and a turbulence SIGMET was in effect between FL200 and FL250 for an area about 20 nautical miles southeast of the event. The turbulence auto-PIREP system (TAPS) generated severe turbulence reports for altitudes between FL276 and FL244 in the hour prior to the event. The event was attributed to a confluence of factors, including the turbulence, the aircraft’s descent profile, and the favorable atmospheric conditions.On January 16, 2024, American Airlines Flight 2516 experienced severe turbulence during descent over Chicago O’Hare International Airport (ORD). The flight, a regularly scheduled passenger flight from Orlando International Airport (MCO), encountered clear air turbulence, resulting in a significant incident involving a flight attendant and a passenger. The turbulence, which began around FL250, impacted the aircraft and caused a significant delay. The flight crew immediately initiated procedures to ensure passenger safety, including preparing the cabin and informing passengers of the turbulence. While the aircraft remained operational, the turbulence caused a serious injury to a flight attendant. The turbulence intensified as the aircraft descended through FL250, leading to a significant drop in altitude. The flight crew reported the turbulence advisory, and the captain instructed the cabin crew to prepare for landing and seat passengers. The seatbelt sign was activated, and the cabin crew worked to secure the passengers’ safety. The turbulence continued, causing the aircraft to descend through FL250, resulting in significant turbulence impacting the flight. The flight attendant, FA1, sustained injuries while attempting to secure her seatbelts, requiring medical attention. The captain communicated the situation to dispatch, requesting medical personnel to meet the airplane at the gate. After landing, FA4 was transported to the hospital, where she was diagnosed with multiple fractures to her left leg and ankle, requiring surgery. An analysis of weather radar revealed strong horizontal and vertical wind shear and gravity waves in the area, consistent with a favorable environment for clear air turbulence. Preflight weather planning predicted light to moderate turbulence between FL290 and FL360, and a turbulence SIGMET was in effect between FL200 and FL250 for an area about 20 nautical miles southeast of the event. The turbulence auto-PIREP system (TAPS) generated severe turbulence reports for altitudes between FL276 and FL244 in the hour prior to the event. The event was attributed to a confluence of factors, including the turbulence, the aircraft’s descent profile, and the favorable atmospheric conditions.