French accident investigators released their final report into Germanwings Flight 4U 9525, which crashed in the Alps in March 2015, about a year later.
Their evidence, obtained from the cockpit voice recorder and other information outlines in more detail how co-pilot Andreas Lubitz, 28, brought down the Airbus.
So how did this final half hour unfold?
Who was co-pilot Andreas Lubitz?
Questions remain about Germanwings crash
Germanwings flight 4U 9525 took off from Barcelona Airport in Spain heading for Duesseldorf, Germany, with 150 people on board, at 09:00 GMT on 24 March.
The Airbus 320 began travelling over the sea towards France, taking about half an hour to climb to 38,000ft (11,600m).
It should have been a two-hour flight and, in the first 20 minutes, the pilots could be heard discussing the stop-over at Barcelona with a flight attendant.
At 09:30 the plane made its final contact with air traffic control - a routine message about permission to continue on its route. Everything seemed to be going as planned.
