Terrorist Or Sadist? Why Evil Germanwings Co-Pilot Intentionally Crashed Flight -- 10 Secrets From The Investigation

The cockpit recorder, recovered Wednesday, revealed that Lubitz "manually and intentionally" began the descent into the French Alps.

Screams could be heard in the background, as well as the main pilot attempting to break down the door to the locked cockpit and avert disaster.

It was Lubitz's "intention to destroy this plane," Marseille prosecutor Brice Robin said.

Investigators insisted, however, that it was not a terrorist plot. "A terrorist?" Robin said. "Absolutely not."

Adding to the mystery, insiders said Lubitz was in good spirits in the months before the crash. "He was happy he had the job with Germanwings and he was doing well," said a local in his hometown of Montabaur, Germany. "He gave off a good feeling."

Lubitz had been a pilot with the airline since May 2014, and officials said he was highly trained and experienced.

However, before that, he was forced to curtail his training in 2008 because of a bout with depression, according to new reports.

The Daily Mail claims he took several months off work at that time, complaining of burn out, but the airline later pronounced him fit to fly.

Lubitz passed all medical tests required to fly, insiders said.

Meanwhile, his parents are being questioned by the police in the hopes of shedding light on his mental state.