You would be wrong actually, ISIS has capable pilots, engineers, etc from Saddam's Iraqi military...
here's a quote from an article i was reading last night
IS militants, however, are no fools. According to our sources in Erbil, IS has already started to hunt for airplanes, helicopters and drones, while trying to seize airfields in Iraq and Syria. In addition, they have announced the creation of a squadron of pilots, engineers and technicians from those Sunni-Arab ex-servicemen who defected from the Iraqi air force, and are even looking for possible recruits in Europe. What if they will be able to create their own air force? And even their own air defenses?
Let's just say they have a few. Do you think they will be able to conduct an effective air campaign?
Of course not.
They can announce anything they wish. The Iraqi and Syria AF have complete domination of the air over their respective countries. Now with the US flying around it would be best if ISIS stayed away from those hangers. As you said...they are not fools.