The airline knows that it sells more tickets than seats in order to guarantee an overspend. Like a dozen passengers flying to Vilnius, Warsaw and other cities, I was refused boarding, despite the fact that I purchased a ticket for £250, I also bought the first seat and paid for priority boarding.
"Priority boarding has been paid for, but put on standby and not allowed to fly." Overbooking is now popular in Europe, cheating passengers has become the norm!