An American Airlines Boeing 777-200, registration N750AN performing flight AA-60 from Tokyo Narita (Japan) to Dallas Ft. Worth,TX (USA) with 269 people on board, was on approach to Dallas descending through about 9000 feet when the aircraft encountered moderate turbulence. The aircraft continued for a landing on Ft. Worth's runway 18R without further incident about 12 minutes later. One passenger received serious, 7 flight attendants minor injuries.
The FAA reported the moderate turbulence resulted in several injuries.
On Mar 26th 2020 the NTSB reported the occurrence was rated an accident and is being investigated by the NTSB.
On Jul 11tn 2020 the NTSB released their final report concluding the probable cause of the accident was:
the passengers failure to comply with the fasten seatbelt sign when the airplane encountered convective turbulence.
The NTSB wrote:
As the flight began its descent into KDFW, the captain illuminated the seatbelt sign and made a public address announcement reminding passengers that the seatbelt sign was on and that they were to "return to your seats and buckle up for the remainder of the flight." Shortly after the captain notified the flight attendants (FA) to "prepare for landing and take your seats", the airplane entered a band of small cumulus clouds and experienced 10-15 seconds of moderate turbulence.
When the turbulence was encountered, the FAs were conducting their final cabin safety checks since the captain had informed them that there might be turbulence during descent. As a result, seven FAs were thrown to the floor and one passenger, who had ignored the seatbelt sign and instructions to remain seated, was also thrown to the floor and injured his left ankle. The FAs notified the flight crew, who arranged for paramedics to meet the airplane at the gate. After landing, the passenger was transported to the hospital where he was diagnosed with a broken ankle and the seven FA's who had received various minor injuries were treated at the airplane and released.