A helicopter of the French gendarmerie flies over Seyne-les-Alpes on March 28, 2015, near the site where a Germanwings flight crashed in the French Alps, killing all 150 aboard. French prosecutors believe that co-pilot Andreas Lubitz locked his captain out of the cockpit and deliberately flew Flight 4U 9525 into a mountainside near Seyne. AFP PHOTO / JEFF PACHOUD