Ten days have passed since the largest airline in the history of Russia. Who is responsible for the safety of Russian aircraft in the sky, from which it consists of - versed The New Times Rescuers and experts at the crash site A321, El-Arish, Egypt, November 1, 2015 Not a single plane crash is repeated one to one, Aviation experts assure. Yes, and they happen infrequently - in 2014 there are 21 cases for 50 million flights, according to the International Flight Security Agency.