I've been there quite a few times. I used to live in Dallas.
When you first go into the museum, you're escorted into a theater to watch a 5-10 minute film. The theater is furnished with 1st class aircraft seats and an Omnimax-like screen.
They have lots of historical items, engine cross-sections, and interactive things for kids.
They added a perfectly preserved DC-3 a few years ago.
The gift shop has a lot of shirts, books, models, and other logo items.
If you're in the area, don't miss it.