Publisher : US Department of Transportation, Office of Inspector General 

Title : FAA Has Made Progress on a UAS Traffic Management Framework, but Key Challenges Remain

Publication Year : 2022

Download Link : https://www.oig.dot.gov/sites/default/files/FAA%20Implementation%20of%20UAS%20Traffic%20Management%20FInal%20Report%20-%2009-28-22.pdf