Basics for Air Traffic Control is a key course in the Air Traffic Training program as it provides trainees with foundational air traffic knowledge and influences trainee throughput to subsequent phases of training. To enable the safe delivery of training during the pandemic, this course was converted from an in-person, classroom training to a virtual training environment. Virtual Basics for Air Traffic Control is taught in a synchronous, online format that allows trainees to attend from geographically dispersed locations using video teleconferencing and learning software. In the present study, an evaluation of the virtual Basics for Air Traffic Control course was conducted to assess the effectiveness of the virtual format. Data on trainee perceptions of the virtual environment, learning activities, instructor-trainee interactions, trainee-trainee interactions, and technology were collected from N = 480 trainees who successfully completed the virtual course. Additionally, test score and pass rate data from N = 79 virtual classes were compared to archival outcome data from the in-person, classroom training. Overall, trainees generally held positive views of the virtual learning environment and felt confident in their knowledge of subject areas covered in the course. However, there were some identified areas of improvement, such as trainee-trainee interactions and the number of devices needed for training. Although analyses revealed few statistically significant differences in test scores between the virtual and classroom formats, the difference in average test scores were small and thus had no practical significance. There were no statistically significant differences in pass rates between the training formats. Implications of these findings for the virtual Basics for Air Traffic Control course are discussed.