The report comes almost a year after co-pilot Andreas Lubitz crashed Germanwings Flight 9525, killing all 150 on board.
Investigators said co-pilot Andreas Lubitz, suspected of deliberately crashing a plane in the French Alps in March, practiced entering the fatal descent settings the same day as the crash.
The Automatic Ground Collision Avoidance System reportedly saved an F16 flying over Syria.
All 150 crew and passengers on board were killed in the crash.
More details have been emerging in the German press about Andreas Lubitz and the circumstances of the crash.
The Germanwings crash on Tuesday was not the first of its kind.
Investigators found the note when they searched Lubitz's flat.
Andreas Lubitz reportedly spent 18 months receiving psychiatric treatment during pilot training for German airline Lufthansa.
Now that authorities believe a pilot involved in the Germanwings crash may have deliberately locked another pilot out of the cockpit, air safety experts question whether reinforced cockpit doors are too secure
Airline founder says "rogue pilot element" puts lives in danger following Germanwings crash.
Many of the messages celebrate the presumed deaths of Catalans who were on the flight.
A fake article gaining traction on the web claims the aviation authority praised pilot in a 2013 article.
Germanwings co-pilot Andreas Lubitz, who lived with his parents in a small town, had 600 hours of flight experience.
The German co-pilot was left in sole control of the plane and pressed a button that sent the jet into its descent.
All 150 passengers on board are presumed dead.
In wake of Germanwings crash, experts call for updated technology to pinpoint crash locations.
Data from the black box, which was found on Tuesday morning, is currently being analyzed.
The two American victims are from Virginia, according to family members.
The airline is using 11 planes from other airlines to cover 40 of its flights today as staff mourn.
"It's so tragic, so sad, so unfathomable," an official said. Most of the students were about 15 years old.
The Lufthansa's Germanwings budget flight was on its way from Barcelona to Duesseldorf.