The missing data deepens the puzzle of what caused the deadly air disaster in Muan, South Korea, late last month.

Jeon Je-young, 71, said his daughter Mi-sook died in the crash. "When I saw the accident video, the plane seemed out of control," Jeon told Reuters. "The pilots probably had no choice but to do it.

“At 11.02 a.m., the pilots contacted Aktau Airport’s air traffic control tower.” “The air traffic controller facilitated all necessary procedures to guide the plane to the runway, turning ...