Flights purchased online, this is your contract with the company, the second copy is completely stored in electronic archives. That is why, you should not be afraid of the loss of air tickets, their damage, you can always print the second copy. During the customs inspection and presentation of air tickets, you need to have a passport with you, and remember the number of the armor that you ordered and you will be allowed to land on the plane without even having a copy of the air ticket.
