Where number, there and series

About one and a half months ago at the Cheboksary airport there was an incident. From the inhabitant of Arkhangelsk, bought the ticket to Saint Petersburg, in LLC "AIRLINE COMPANY "POBEDA" at registration for flight demanded surcharge. The passenger booked the ticket on Internet, and, having literally fulfilled the requirement of a registration form — to specify passport number — entered in a reservation only the last six figures from the document proving the identity. Certainly, at registration...