The location of this wonderful museum is in itself worth the visit: it is housed on a retired aircraft carrier, the USS Intrepid. The visitor can wander around looking at how the sailors and pilots lived on the ship during its time of commission in World War II and up to Vietnam. On the deck and in the plane holds, the museum displays decommissioned aircraft that flew in various wars, as well as spy aircraft. In fact, the A-12 Blackbird is one of the main draws of the museum.
To top it off, the museum has recently added to its collection the legendary supersonic civilian aircraft Concorde, offered to the museum by British Airways.
Additionally, the submarine USS Growler also forms part of the museum. There, visitors can get a good feeling of the cramped quarters and claustrophobic conditions that were the norm in World War II conventional submarines.
I would vote this one of the best air and space displays around.