TSA checkpoint traffic monitors the amount of passengers that travel through all TSA checkpoints in a given day. By April 6th the pandemic had reduced passenger throughput to virtually zero, but it has slowly climbed up over the next few months. That growth seemed to stagnate at the beginning of July as new cases of COVID-19 began to climb again in the US. This data is updated weekly on the TSA.gov website. The days of the week are lined up so that a Monday in 2020 corresponds to the equivalent Monday in 2019.