How to change the types of aircraft available in a Theater?

[smg13]

Hello.

I forgot which file one had to edit to make the list of aircraft that appear on a theater. I remember it was a single file, and it was just a matter of erasing (or adding) the name of the plane type so it would not appear (or do appear) on a theater; specifically on the TE Editor menu when adding air units. Does anyone know which file is it?

Thanks.