airstrikes only ever reduce my units health to orange. i can still use the unit or even evac and get 2 command points back.
i lose 2 points and the enemy loses 4. if my gunship gets hit i use its special attack then evac so the enemy still loses out.
only airstrikes which do any main damage are level 3. even then you need 3 upgraded uplinks, several million credits to buy it in the first place and 6 command points.
6 command points to defeat a unit which costs 4 (only 2 in defcon)