Ethiopan Airlines says via Twitter:
"Senior captain Yared Getachew, who had more than 8,000 flight hours, was in command of the plane.
His first officer, Ahmed Nur Mohammod Nur, had 200 hours of flight time. "
Assuming no typos, is that difference in flight hours very unusual, or is it a case of a relatively new first officer being teamed up with an experienced colleague?