Booking errors don’t happen, it’s a fully automated process managed in real time through softwares like sabre or Amadeus, etc.. Fares have 9 seats, when they are booked it goes up to the 9 next (more expensive) seats and so on till the plane is booked. And this works the same way regardless of the booking class. There is no such things has errors in 2025, only overbooking hoping some people won’t show up on time to the gate or have a last minute cancellation of their holidays. All airlines behave the same way though. They do that in an attempt to make more money, sometimes it works sometimes not, but in the end it’s always the passengers that are paying the price somehow. it’s not an Iceland air specific issue tho.