They do have automatic Check out-in kiosks, but we checked in online the working day before so we would not have to bother with the (nonexistent) strains with the KEF airport.
Boarding and crew was good. Flight was https://keziaxpwp972082.webbuzzfeed.com/30310023/how-to-change-flight-with-icelandair-things-to-know-before-you-buy