The COVID-19 Air Traffic Visualization (CAT-V) tool combines case data from Johns Hopkins University with detailed air travel data from the International Air Transport Association. Together, these data sets make it possible to visualize how coronavirus disease 2019 (COVID-19) infections and commercial air travel have interacted to export infection risk across the world. Given air travel data and reported infection rates, our tool can also be used to estimate future patterns of COVID-19 transmission. As a result, policymakers, analysts, and others can estimate the impact of travel-related policy interventions, such as restricting air travel from various countries.