China Southern Airlines Flight 3943 (CZ3943) was a China Southern Airlines flight from the former Guangzhou Baiyun International Airport, Guangzhou to Guilin Liangjiang International Airport, Guilin, China. It crashed on descent to Guilin Airport, killing all 141 aboard. It was the deadliest accident involving a Boeing 737-300 at the time. It is also the accident with the most fatalities involving China Southern Airlines to date.