The Near East Archaeological Society endorses archaeolgical sites that meet specific requirements.
Khirbet el-Maqatir
Currently, Khirbet el-Maqatir under the direction of Dr. Scott Stripling is endorsed by the society. 

Excavations at Khirbet el-Maqatir began in 1995. Thus far, the city gate and wall system have been revealed, large amounts of pottery from the time of Joshua, evidence for fire, and a Byzantine monastery. In 2010, we continued to excavate these and other features as we uncover the plan of this 15th century BC Canaanite fortress.  In 2011, the Associates for Biblical Research returned to continue their field work at this exciting archaeological site.  In 2016, the final season is planned as efforts will be shifting to Shiloh

This research and excavation is being conducted under the direction of ABR Director of Excavations, Scott Stripling, DMIN.  Topography, fortifications, and pottery finds all strongly suggest that Khirbet el-Maqatir is the Ai of Joshua 7-8.