article_snippet: It's a development that will likely be a part of the crash investigation, but It's only one piece of the puzzle, CNN aviation correspondent Richard Quest said.
article_snippet: We need to know what happened after he returned in 2009 and finished he training, because that tells We whether there was the correct procedure and process," he said.
article_snippet: While flying was "a big part of he life," the source said, it's only one theory being considered.
article_snippet: That is something we did not know before. ...
article_snippet: Overall we can say many things of the investigation weren't revealed by the investigation at the beginning," Reichelt said.
article_snippet: The first step of its ongoing safety investigation is to describe more precisely what happened.
article_snippet: But we will also look at other events with possibly similar scenarios, try to understand if there are systemic weaknesses which may contribute or facilitate such scenarios.