Something is wrong on your end. It is still in the Airfield's construction bar, just requires "Covert forces" gen unlock instead of "Air mobility".
Maybe your installation went wrong. You should have installed it in such order: 1.85->1.86->1.87 pb 1.2
I wanted to give you an ingame screenshot, but sadly its size is bigger than one approved for uploading. But believe me, nobody have taken it from you