Was it safe to fly over Ukraine?
The DSB has suggested there was sufficient reason to close the airspace above eastern Ukraine because of the conflict.
In the months leading up to the crash, the conflict in Ukraine had expanded into the airspace and a number of military aircraft had been shot down
Although the area where the jet crashed had a no-fly zone in place up to 9,754m (32,000ft), the airliner was flying above the limit at 10,058m (33,000ft).
The airspace over eastern Ukraine was busy with commercial flights that day - 160 planes flew over the region.
The flight tracker Planefinder shows how busy the airspace was in the 48 hours leading up to the disaster.