Icelandair Seat Upgrade Passengers,If you have already bought a flight ticket for a lower class, then do not worry because you will still be able to move to one of those cabins by using the Icelandair upgrade services. know about rules relating to this can be recognized by going through the Icelandair upgrade policy.visit airlines website or dial their customer service.for more visit here- https://www.airlinesgrouptravel.com/blog/how-do-i-upgrade-my-icelandair-ticket