Two pilots are believed to have fallen asleep on the job during a flight from Sudan to Ethiopia on Monday.
The plane, an Ethiopian Airlines Boeing 737-800, took off from Khartoum airport and was flying at 37,000 feet "when the pilots fell asleep", according to aviation news site Aviation Herald.
The Boeing 737 was cruising on autopilot as the pilots slept and failed to land at Addis Ababa Bole International Airport in Ethiopia as scheduled.