I think the number is there to help the user to determine what level of the BT mod they want to apply, as the more aircraft that are flying, the greater the demand on your cpu.

However, I don't think it would be too difficult for JJJ65 to hide that information for those who prefer not to see it.

“With Major Lawrence, mercy is a passion. With me it is merely good manners. You may judge which motive is the more reliable.”