Keflavik is the main international gateway airport to Iceland. It is the base of Icelandair.
Other carriers you’ll see here include:
Iceland Express (Hello)
The airport covers a vast area, being a former US air base. It has two runways, and a number of smaller remote aprons and hangars where the military operations used to happen. These are still sometimes used by biz jet and troop flights, and other operations.
The airport has one passenger terminal, with a long pier extending into the apron. Before going into the building, at departures level you can see the apron at either side of the entrances and get an overview of most aircraft parked there.
Once through security, you will have free reign of the pier, and can log most aircraft easily. You can see across to the runways from the end of the pier. The cargo apron is also visible alongside.
Traffic can be a little slow. You’ll find that the Icelandair flights all come in together 2 or 3 times a day, connecting European and North American flights together.
To see aircraft on remote aprons, a car is recommended due to the large area. You may also be able to get some landing shots at the end of the runway in use.