The SAS Museum sits in its own building on Gardermoen West, about 5 minutes from the airport. It started at Fornebu in 1989 and moved here in 2003 when the collection expanded.
The museum is run entirely by retired SAS employees - pilots, cabin crew, technicians. These are the people who actually lived the history they're showing you. When you get a guided tour, you're hearing first-hand stories, not rehearsed scripts.
The collection covers Scandinavian aviation from the early 1900s to today, including the three parent companies that merged to form SAS: the Swedish ABA, Danish DDL, and Norwegian DNL. You'll find a complete collection of uniforms through the decades, models of every aircraft SAS has operated, and an archive of photographs and documents.
There's a flight simulator built from parts of a DC-9 that met an unfortunate end - they'll tell you the story when you visit. Six floors up is an observation tower with views across the western runway and terminal.
If you have a long layover, this is easy to reach from the airport. Take the shuttle bus S55 from the lower level - it runs every 20-30 minutes to Park Inn Hotel West, which is about 100 metres from the museum. You can also take Ruter bus 400 or 420 to Lilleplassen and walk 5 minutes.
The museum is open Tuesdays 10:00-15:00 and Sundays 12:00-16:00. Free parking if you're driving.