Firstly the location. We sent ages planning hot to get here.... and the location of the museum is incorrectly given on various websites (including the start on trip advisor). It IS near Cuatro Vientos airfield. But its the other side of the Auto Pista M40 from the airfield it's self.
One option, as mentioned in quite a few reviews is to catch the Metro to the Cuatro Vientos Metro stop. This is indeed a good 20 min walk from the museum - just follow the main road heading in the direction out of the city when you leave the Metro station and you will get to a footbridge over the railway you have been walking next to and you are there. There is a grass path between a barrier and the railway - all very walkable.
As it was raining when we left the city we didn't fancy the walk, so we risked the bus. (we don't like busses usually - lots of chances of getting hopelessly lost). Get to Madrid Principe Pio bus station (Its on the Merto) and catch any of the busses which head for Alcorcon OR Mostoles. The station is easy to navigate and it really is very straightforward.
We asked the driver Museo del aire (We dont do Spanish at all well) and he knew exactly where we wanted. (Not sure of the cost - our 5 day travel pass covered it). After 12 or 13 mins the bus passed Cuatro Vientos metro stn and then pulled into a bus stop and the driver waved us off. Theres a path over a footbridge and a walkway into a Military area with sone very laid back Security guards who didnt bother us (Its all quite well signed).
The Museum is free - only slight hassle is you cant take rucksacks in but there are free lockers. Quick metal scanner and you are in.
The collection is quite impressive - The Strattotanker, something I had never seen before is amazing - there is an extensive collection of cold War Jets (East as well as West and some SAABs thrown in ).
There are 7 hangars with a whole plethora of stuff - simulators - radios etc etc as well as an extensive collection of planes incl HE111s and JU52s. The coffee shop is just a counter - no seats but its ok.
All in all a fantastic free museum. Getting back to the city is easy - just stand at the bus stop opposit the one you got off and all the busses go back to Madrid Principe Pio.
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