Could ISIS fighters be training as warplane pilots capable of turning their weapons on coalition aircraft? That's the worrying prospect suggested by an unverified report from the London-based Syrian Observatory for Human Rights that ISIS has three warplanes in its possession in northern Syria. The Syrian opposition group also claims, citing reliable sources in Syria, that former Iraqi military officers are training members of the Sunni extremist militant group to fly them. The planes are at the Al-Jarrah military airport east of the contested city of Aleppo, the Syrian Observatory for Human Rights said.