More than 60 U.S. stadiums and other venues are deploying an app from Clear to verify people’s Covid-19 status, placing the New York company known for its airport security fast lanes at the forefront of a national debate over “vaccine passports.”

New York state will allow large stadiums and arenas, such as Citi Field and Madison Square Garden, to reopen for sports and concerts in February, with sharply limited capacity and other measures to prevent the spread of Covid-19.

With the National Football League season in the books, the league offered the use of NFL stadiums for mass Covid-19 vaccinations.