(Washington, D.C.)The Transportation Security Administration is extending the face mask requirement for travelers across all transportation networks throughout the United States, including at airports, onboard commercial aircraft, on over-the-road buses, and on commuter bus and rail systems through September 13.

The TSA’s initial face mask requirement went into effect on February 1 and was set to expire on May 11 as a way to minimize the spread of COVID-19. But TSA officials say about half of all adults have at least on vaccination shot, and masks remain an important took in defeating the pandemic.