I recently went to the Air Museum, on the Cuatro Vientos air base. It�s got all the sort of things you�d expect. Lots of craft of all types, mementoes of aviation heroes (most of whom fought on the winning side of the Civil War though there are also a few others presumably added recently), a good display of motors, uniforms, flight simulators, etc.

It�s free on Wednesdays, though I think on the first Wed of each month there�s an air show, which isn�t free.

To get there: it�s just at the edge of Zone A, but there isn�t really a convenient way to get there without using interurbano buses as there�s nothing beyond it before Alcorc�n.

FWIW you aren�t any longer able to use Zone A Abonos for travel on interurbanos for journeys wholly within Zone A. What you can do is:
get to Cuatro Vientos Renfe/Metro, emerge on the east side of the N-V (which is the side that the Renfe station is on) and walk south for 15 minutes between the Renfe track and the N-V (this is only a few metres wide so you can�t go wrong). You�ll see a water tower bearing a Museo del Aire poster, and you enter via the entry to the air base (in principle you could be asked for ID, though I wasn�t).

If you start on the wrong side of the N-V you�ll have a much longer and less obvious walk. Stephen