ISIS will not be degraded or defeated by just airpower. One observer is Christoper A. Lawrence - the Executive Director and President of the Dupuy Institute. He has penned an article entitled "Airpower: Just Part of the Counterinsurgency Equation", Small Wars Journal, January 18, 2016.
His viewpoint is that there is no concrete evidence that airpower has destroyed an insurgency. I agree with the author that airpower is limited in its ability to counter an insurgency; but am troubled with comparing the Islamic State to an insurgency; I think they past the stage of insurgency in Iraq and Syria - at the moment. ISIS controls territory and masses forces to both gain and defend territory. Once an insurgency moves to a more conventional phase they start to present targets. Of course, more than just airpower is needed to defeat ISIS - advisors and ground forces are needed; but not necessarily U.S. ground troops.
A-29s Arrive in Kabul. The U.S. Air Force delivered four A-29 Super Tucanos to the Afghan Air Force in January 2016. Read more in "Afghan Air Force receives first four A-29s", U.S. Air Force News, January 19, 2016.
India's Mi-35 Helicopters. The four helicopters recently provided by India to the Afghan Air Force (AAF) are almost operational and may soon see combat in Helmand province. Read "India's Mi-35 Helicopters Ready for First Battle in Afghanistan", NDTV, January 21, 2016.
More C-208B Aircraft? The U.S. DoD has approved a new contract for 18 additional C-208B aircraft for the Afghan Air Force. The contract is worth about $55 million. (Airforce-techology.com, Jan 22, 2016).
A-10 Retirement Delayed. "After trying to retire the battle-tested A-10 Warthog for the past two years, Air Force officials concede that the plane is key to the war on ISIS", Read "Air Force to Delay A-10 Retirement, Thanks to ISIS", Defense One, January 13, 2016.
Video - 25 Years of Bombing. The Center for Strategic & International Studies (CSIS) has produced a 5-minute long video entitled 25 Years of Bombing Iraq published on YouTube.com on January 14, 2016. The narrator provides a brief history of airpower and analyzes the contributions and limitations of airpower. www.youtube.com/watch?v=KUttCk0L8Zw