Although in truth, any airfield that let paratroopers drop COMPLETELY unopposed would be abandoned, since there would always be at least minimal base security in a time of war. (thus requiring a combat, even if it only lasted an hour) And abandoned airbases would tend to be a little shy on fuel for the transports.
Exactly this. As for me, I always imagined that there was ALWAYS a minimum number of security units inside provinces - and be it just armed civilians. SO I really liked the HoI3 combat delay concept (though the tech could really use 2-year steps like others and 120h basic cooldown would be sufficent).
As its now, PAR is vastly, vastly overpowered, at least vs. the AI. Btw, has anyone seen an air assault mission being intercepted? For me it was possible to paradrop right during the battle of britain, totally unopposed by enemy INT or FGT.
@midget: PAR usually suffered quite some losses during paradrop. I can't remember the exact figures, but there are always several men that get lost (and end as MIA), while others break legs, arms and alike and end up in a shape were they are barely ready for combat. Iirc (can't give a source right now, but *think* I have read it somewhere), a 10% STR loss would be realistic for a *real* air assault drop, even before combat starts.
But btw, the out-of-supply bug during air assault really needs a fix. It's ironic - you can use PAR for anything except the real reason why they were made, simply because the -50% combat penalty in addition to the paradrop malus will kill you combat efficency...