Maximum number of AC based outside HQ

[MajorBloodnok]

Does this number increase in proportion to the number of base airports you have?  Eg, are you able to base more AC outside of your HQ if you have 6 airports as opposed to 3?

thanks

[JumboShrimp]

No, the number depends on the year.  Every year, it goes up by an increment.

[MajorBloodnok]

thank you