Pro tip for the airport when you leave, because signs are lacking. When you walk in there are self service kiosks to the right, along the outside windows. Check in and tag your luggage there. These are everywhere and easy to find. From there, you should avoid the huge line of tourists trying to drop bags off at the counter. On the side/to the left of the counter drop off is a self-weigh/drop off spot without any signage we could see. Self explanatory on what to do when you find it, but was a pain to locate when we were flying out last week. Bypassed hundreds of families waiting in line who were unaware of/too stupid to use it. If you’re flying back to the US from KEF, even if it’s just a layover, there’s a secondary security screening before getting to the D gates. Just plan accordingly in case you’re eating/drinking before going to gate.