So what are the reasons for no US air strikes around Kobane?
Where are ISIS supposed to go after they're routed from Iraq? The town of Raqqa is nearly empty of ISIS, the majority of the fighters are in the Kobane countryside. It's estimated that one third (!) of their fighters are taking part in the attack on Kobane. They're easy pickings for the F16s and whatever else the West has to offer.
Btw, PKK are officially in Kobane and Peshmerga have been deployed into Rojava, but the route to Kobane is not clear, too many ISIS towns to fight through. Kobane is likely to fall soon, after two years of resistance and no help from the rest of the world.