LA VERNET, FRANCE - MARCH 28:  Relatives stand at a monument to honour the victims of Germanwings flight 4U9525 in front of the mountains near the crash site on March 26, 2015 in Le Vernet, France. France. French authorities confirmed that Andreas Lubitz was alone in the cockpit during the rapid descent of flight 4U9525 until it crashed into mountains in southern France four days ago, killing all 150 people on board. Lubitz hid signs of illness and it is thought he acted deliberately in steering the aircraft to its destruction.   (Photo by Thomas Lohnes/Getty Images)