France: The first half of Germanwings Flight 9525 was chilling in its normalcy. It took off from Barcelona en route to Duesseldorf, climbing up over the Mediterranean and turning over France.

The last communication was a routine request to continue on its route. Minutes later, at 10:30 AM Tuesday, the Airbus A320 inexplicably began to descend. Within 10 minutes it had plunged from its cruising altitude of 38,000 feet to just over 6,000 feet and slammed into a remote mountainside.