? about calling in air support

[budd]

Hello,
Taking a break from CSME and finally giving Panzer Battles the time it deserves. The last 3 turns ive tried to call in some air strikes, is this something you have to do at turn start? The planes are available at turn start and then go gray when i check later in the turn. The hex contains an enemy unit and is spotted, what am i doing wrong? Recon has worked just fine. I send the recon out to spot ahead and try to target the nasties waiting for me, also tried calling in air strikes on enemy units spotted by land units but the selection is grayed out. I'm sure its probably something simple i've missed.

Really enjoying the game while learning it. I own Normandy but currently playing the demo pbem. the demo is great, well done.