The State Department plans to resume regular evacuation flights from Afghanistan before the end of the year to help U.S. citizens, residents and some visa applicants leave the country, a senior State Department official said.

The small number of U.S. citizens and thousands of Afghans left behind after the chaotic evacuation effort in the final weeks of the U.S. presence in Afghanistan could be eligible for seats on the U.S.-sponsored flights.

The last U.S. troops departed on Aug. 31, bringing the 20-year conflict to an end. Since then, a small number of flights have carried Americans, Afghans and other foreign passport holders out of Kabul and the northern city of Mazar-e Sharif, and some people have left over land, through border crossings to Central Asian countries and Pakistan.

The State Department has yet to schedule a date to resume evacuation flights because it is still working through arrangements with neighboring countries, the State Department official said. Among the issues being worked out are documentation for travelers, permission to fly over other countries and procedures with the Taliban and foreign governments.