Keeping to principles (all highly arguable):
- The first function of air power is reconnaissance — identifying targets. Roaming around looking for something to attack reflects either lack of such intelligence, the desire to be seen to be doing something (anything), or having more aircraft than you know what to do with (e.g. USAAF & RAF in 1945)
- Airpower is best used in support of specific ground operations (e.g. the recapture of Sinjar)
- Next, against transport systems and the production of vital basic materials (e.g. oil)
- Lastly against manufacturing capacity (assuming ISIS has any to speak of).