They now have a A12 Blackbird out front. Along with the planes already out in front of the air museum.
You need a whole day here. I lost a few hours sketching in one of the bird exhibits alone. There is a lot to sketch here, including The Colosseum. There is also a 747 near the Space Museum.
Lots of dino/animal bones to draw also. If you're studying anatomy this is a great place. As a matter of fact you can start researching just about any project here.
Here's a few sketches: