Building a Long Campaign

[WarlordATF]

I'm running a Pre-Expansion install and trying to learn the campaign file structure.

 

I am trying to build a campaign that spans an entire year, but after a few months the enemy are running out of aircraft and aerodromes are disappearing from the campaign map. Is there any way to resupply these squadrons with new pilots and aircraft or do i need to add new squadrons with later start dates?

 

Eventually i would like to build a campaign that spans the entire war, but i am still learning right now.

 

Thanks!