View of Ban Xon" 3040 ft. airstrip. Ban Xon (also known as Ban Houei Pamone) replaced Sam Thong after its fall in 1970 as the USAID refugee relief center for Xieng Khouang and Houaphan Provinces. Office and warehouse buildings are situated alongside the center right segment of the runway. The hospital is located center left above the airport. A refugee village is on the lower right.