Hi.
If you're going to Denmark, I can definitely recommend two spots.
One is a dedicated vintage museum at the airfield Stauning (EKVJ) in Jutland, the western peninsula of Denmark.
The other is a recently opened branch of the Danish Technical museum in Elsinore (Helsingør) approx. 25 NM N of Copenhagen. That means you can go and see Hamlet's castle Kronborg as well ;-)
Enjoy your trip