Abu Hajar airport is located in Hasakah province in northeastern Syria, which is under the control of Kurdish People's Defense Units (YPG). The Syrian government has not given the US permission to have a base in Syria or carry out airstrikes there.
According to the report, for around two months US experts have been in the region developing the airfield, which hasn't been used since 2010. It has a 2.5 km runway which can be used by fighter jets to carry out airstrikes, and to bring in military supplies.
In August, the US began launching airstrikes against Daesh from Incirlik airbase in Turkey, after the Turkish government reluctantly gave permission for the operation following months of negotiations. Before that, US forces flew to Syria from the Muwaffaq Salti air base in Jordan, and from more distant bases in Qatar and elsewhere in the Persian Gulf.
