I only know of a couple and I can get to them if I'm on the street. There's one that's on either 45th or 46th on the North side between 5th Ave and 6th I believe. It's mostly railroad cars and it's downstairs from street level. I'm pretty sure time travels backward in this shop.
The other is on York and 80 something I believe if it's still open. Tiny shop, boxes piled from the floor to the ceiling, nasty owner, but has lots of planes. I'm sure someone can elaborate?
E pur si muove -Galileo