article_snippet: The Germanwings Airbus involved in today's crash (pictured) would have received a safety warning after a sister plane suddenly lost altitude last year.
article_snippet: The safety warning related to all Airbus A318, A319, A320 and A321 – including the Airbus A320 involved in today’s disaster.
article_snippet: The safest part of a flight is when A similar Airbus plane to that involved in today's crash is at cruise elevation.
article_snippet: Safe: Aviation experts tweeted this graphic showing just how many Airbus A320s are in the air at any time .
highlights_snippet: Air safety agency sent out directive warning operators to be aware .
  
highlights_snippet: Plane is considered extremely safe and is widely used around world .