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Lufthansa executives visit Alpine crash site amid questions about co-pilot

  • FILE - In this  Thursday, March 26, 2015 file photo, rescue workers work at debris of the Germanwings jet at the crash site near Seyne-les-Alpes, France. Investigators recovering remains from all 150 people aboard a German passenger jet that crashed into the Alps have accelerated their timeframe for identifying and matching their DNA _ whether that be from a body part or only a shred of skin. (AP Photo/Laurent Cipriani, File)

    FILE - In this Thursday, March 26, 2015 file photo, rescue workers work at debris of the Germanwings jet at the crash site near Seyne-les-Alpes, France. Investigators recovering remains from all 150 people aboard a German passenger jet that crashed into the Alps have accelerated their timeframe for identifying and matching their DNA _ whether that be from a body part or only a shred of skin. (AP Photo/Laurent Cipriani, File)  (The Associated Press)

  • Patricia Willaert, center, the prefect in charge of regional law and safety, speaks during a press conference in Seyne, France, Tuesday, March 31, 2015. European investigators are focusing on the psychological state of a 27-year-old German co-pilot who prosecutors say deliberately flew a Germanwings plane carrying 150 people into a mountain, a French police official said Monday. (AP Photo/Claude Paris)

    Patricia Willaert, center, the prefect in charge of regional law and safety, speaks during a press conference in Seyne, France, Tuesday, March 31, 2015. European investigators are focusing on the psychological state of a 27-year-old German co-pilot who prosecutors say deliberately flew a Germanwings plane carrying 150 people into a mountain, a French police official said Monday. (AP Photo/Claude Paris)  (The Associated Press)

  • FILE - In this March 30 2015 file photo, forensic scientists of the Criminal Research Institute of the National Gendarmerie (IRCGN), process DNA taken from the body parts of people involved in the crash of Germanwings jetliner, in Pontoise, outside Paris, France. Investigators recovering remains from all 150 people aboard a German passenger jet that crashed into the Alps have accelerated their timeframe for identifying and matching their DNA _ whether that be from a body part or only a shred of skin. (AP Photo/Christophe Ena, Pool, File)

    FILE - In this March 30 2015 file photo, forensic scientists of the Criminal Research Institute of the National Gendarmerie (IRCGN), process DNA taken from the body parts of people involved in the crash of Germanwings jetliner, in Pontoise, outside Paris, France. Investigators recovering remains from all 150 people aboard a German passenger jet that crashed into the Alps have accelerated their timeframe for identifying and matching their DNA _ whether that be from a body part or only a shred of skin. (AP Photo/Christophe Ena, Pool, File)  (The Associated Press)

The heads of Lufthansa and its low-cost airline Germanwings are visiting the site of a crash that killed 150 people amid mounting questions about the co-pilot and how much his employers knew about his mental health.

Lufthansa CEO Carsten Spohr and Germanwings CEO Thomas Winkelmann touched down Wednesday by helicopter in Seyne-les-Alpes, near the ravine where the A320 jet shattered into thousands of pieces March 24.

Investigators believe co-pilot Andreas Lubitz intentionally crashed the plane. Lufthansa said Tuesday that it knew he had suffered from an episode of "severe depression" before he finished his flight training.

German prosecutors say Lubitz's medical records from before he received his pilot's license referred to "suicidal tendencies," but visits to doctors since then showed no record of any suicidal tendencies or aggression against others.