Lufthansa Chief Executive Carsten Spohr and Germanwings Managing Director Thomas Winkelmann arrive to attend a news conference near the memorial for the victims of the air disaster in the village of Le Vernet

Lufthansa Chief Executive Carsten Spohr (R) and Germanwings Managing Director Thomas Winkelmann (L) arrive to attend a news conference near the memorial for the victims of the air disaster in the village of Le Vernet, near the crash site of the Germanwings Airbus A320 in French Alps April 1, 2015. Lufthansa said on Wednesday it will take a long while to establish the events that led to the Germanwings plane crash last week, killing the 150 people who were on board. REUTERS/Jean-Paul Pelissier