The Aviation Systems Division’s Air Traffic Management (ATM) TestBed team conducted an online two-day training, for 20 participants, organized by the Federal Aviation Administration’s William J. Hughes Technical Center (WJHTC), August 18-19, 2020. The participants represented NASA Ames and Langley Research Centers, FAA HQ and WJHTC, Boeing, MITRE, and ENAC (Ecole Nationale de l'Aviation Civile), the French civil aviation university. TestBed was well received as a potentially synergistic ecosystem for the community collaboration, and participants suggested extensions to its capabilities. Specifically, participants requested to be able to use the TestBed TrafficViewer for human-in-the-loop experiments being pursued at FAA facilities, such as the NextGen Integration and Evaluation Capability along with the Florida NextGen Test Bed.