The 'Plane' interface

[tf_neuro]

It may be, and probably *is* me but... what's the 'plane' interface all about?

Whenever I click it, it always shows an 'anson' with army 'italy', etc.
I can select planes, set nationalities, numbers, etc, but the changes that I make are not saved.

I can't figure out where to set my guns' convergence... I remember I did that once, just after installing the game for the first time, but I havent been able to change it ever since.

In other words, the interface should be more straightforward... or maybe it's ok as it is but it's not working?
Seems to me that the 'Plane' interface does nothing at all...