A fairly simple thing could be accomplished without any scripting.
Or at least, very little
First, make a waypoint for your Broncos, make it "Activated by Radio Whateveryouwant".
Then make a waypoint above the enemy position, or just in the area where you will be fighting.
Now, you can call for them by just using your radio.
That get's them airborne, get's them over to where you want them to be, and if you change the waypoints around a bit you can set them to combat mode, always attack and so on.
That way, if they see any enemies, they will attack.
Now, to add more goodies to this.
If the Broncos are bombers or something, just add an invisible H over each enemy position, and once the Broncos get to the CAS waypoint, have them attack by doing this:
Bronco1 doTarget H1; Bronco1 doFire H1
Continue for each Bronco, or if they're in a group.
"_X doTarget H1" forEach Units BroncoGroup; "_X doFire H1" forEach Units BroncoGroup
It's always best to have them target it first, otherwise they might ignore your orders.
Try that, and see if it works. After that we'll make you a more advanced script