OK, lets simplify things a bit. First, create a group of A10s well away from the area of the mission. Make sure their special field is set to "flying".
Now give them a Hold waypoint near where they are inserted. Depending on what kind of airstrike you want, set a Seek and Destroy WP or Destroy WPs on the targets. Lastly, give them a Hold WP somewhere far away, which they can go to when their job is finished.
Now make 2 triggers. Set the first one up for when you want the radio message to appear - say when the player gets to a certain area.
on activation: 1 setRadioMessage "A10s Weapons Free"
You may want to add some chatter between you and the pilot at this stage, use the sidechat command.
Now the second trigger.
activation: Radio Alpha
type switch
Syncro it with the A10s first hold WP.
So what happens is this. The A10s just circle around their hold wp. The player gets into the correct area and the radio option appears. (make sure you tell him he can order air support) When the player uses the radio the A10s are "switched" into their next WP (Seek and Destroy) so in they come.
And that's it. Make it work like that before you look into the camcreate command. It's good because it helps the game run faster - you don't have the A10s going all the time.
(Check my syntax in the Command Reference in the Ed Depot.)
Hope that all makes sense