The Biden administration has faced growing pressure to lift the mask requirement for air travel and public transit. Earlier this month, Republican leaders on the House and Senate transportation committees reiterated their call for President Biden to “rescind or decline to extend the mask mandate.”

In late March, 21 mostly Republican-led states sued the government, seeking to immediately end the mask requirement.

Last month, executives from 10 airlines, including American, United and Delta, sent a letter to Biden urging him to end pandemic-related travel policies, including the mask mandate.