HorseFly is an unmanned cargo delivery aircraft. In a deal completed in November 2019, Workhorse will jointly develop the program with Moog, which has separately acquired Workhorse's SureFly eVTOL aircraft program.

 In October 2019, Workhorse and Unmanned Systems Operations Group began operating the HorseFly for medical supply deliveries in San Diego, California, under a pilot program approved by the U.S. Federal Aviation Administration. As of November 2019, the companies had not published a timeline for type certification.