Members of Al-Qaeda's Syrian affiliate and its allies sit on top of a former Syrian army figther jet after they seized the Abu Duhur military airport, the last regime-held military base in northwestern Idlib province on September 9, 2015 in the latest setback for President Bashar al-Assad's forces. Al-Nusra Front and a coalition of mostly Islamist groups captured the military airport after a siege that lasted two years, the Syrian Observatory for Human Rights monitor said. AFP PHOTO / OMAR HAJ KADOUR