The Islamist militant group Ahrar al-Sham is emerging as the most significant insurgent faction in northern Syria.The group's latest success came on 11 February, when it captured the Jirah Air Base, 70 km east of Aleppo city. Although Jirah was primarily a Syrian Arab Air Force (SAAF) training facility, its L-39 jets there were pressed into service as ground attack aircraft from July 2012.
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