First: FLash Catalyst ist a great tool!
Second: .. but where can i say, that my export project should be an Air-Project?
I Drag the/import the fx Project to Flashbuilder and it creates an Air-Project instead of a "normal" Flex Project??
You can easily change the project type in Flash Builder. Just right click on the project in the Project Navigator, choose Add/Change Project Type > Convert to Flex Desktop Project.
Thanks for the feedback!
*Ding* That's great
Hint: It would be great to define that Feature in Catalyst directly