Xiamen Air made this announcement on social media on December 1, 2018:
December 1 marked that the Boeing 757 ended his era of being a passenger airplane in China as our last Boeing 757 touched down in Xiamen Airport and completed its final commercial flight. Farewell, the most handsome member of the fleet.
Note: Xiamen Air operated four Boeing 757-200s at the end. B-2868 (msn 32941) had the honor of operating the last revenue flight, flight MF8512 from Shanghai (Hongqiao) to Xiamen.