In my 20's, I took a group of college debaters on a tour in England and Scotland. We flew on Icelandic Air, and switched planes in Keflavik. The layover was sheduled to be 12 hours. The flight over landed in Iceland on May 1 around 8:00 AM. As it was "May Day” in Iceland, most of the country was on strike and we were not allowed to leave the international floor of the airport (one of the debaters had family friends in Rekyavik who had planned to take us around.
Restricted to the Int'l floor, we hit the bar for drinks. After 1 drink, they announced last call at 9 AM. It seems there were Int'l flights only twice a day, 12 hours apart. We were the only passengers there. The airport, including bathrooms, had lots of teac.. LIke the airport was built by Dansk.