Safety recommendation
NTSB Recommends FAA Develop Software to Identify Duplicate Flight Call Signs
The NTSB recommends the FAA create software to detect similar or duplicate flight call signs in use or likely to be in use in specific sectors.
The NTSB recommends that the Federal Aviation Administration develop software programs to identify duplicate and similar flight call signs that are in simultaneous use or are likely to be in simultaneous use in an individual sector or normally-combined sectors of both en route and terminal facilities. The recommendation is part of a broader effort to enhance aviation safety by reducing the risk of communication errors.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-89-083