Graham Tranter
Google
This was our second stop in touring all Balboa Park had to offer and was one of our 3 favorites from the trip. It started out great with an SR71 chassis on display outside the building.
Inside the museum is separated into exploration (including space), old civilian (Spirit of Saint Louis), old military and new military with some nicely setup diorama's. My travel companion is into planes so this was a great museum for us to visit and we would definitely do it again.
I don't think it quite stacks up to the Air Museum in Seattle in terms of number of planes, but the layout, diorama's and additional things like pictures, writeups, and so on may have been better. We bought the all museum access pass which made this a $4-5 visit. Well worth it.