article_snippet: That hasn't been used either in this case, so all these safety nets we are so proud of here have not worked in this case," Carsten Spohr said.
article_snippet: That is, "unless the person on the inside locks the inside and this apparently has happened here," Carsten Spohr said.
article_snippet: I think we look at that as well, but we should not put the whole system at stake just because of this terrible single accident," Spohr said.
highlights_snippet: So all these safety nets ... have not worked in this case," Lufthansa CEO tells CNN .
  