On January 12, 2021, CDC announced an Order requiring all air passengers arriving to the US from a foreign country to get tested no more than 3 days before their flight departs and to present the negative result or documentation of having recovered from COVID-19 to the airline before boarding the flight.

Do I need to get tested for COVID-19 before traveling?

Travelers who are fully vaccinated or who recovered from COVID-19 in the past 3 months do not need to get tested before departing the United States for international travel or before domestic travel unless their destination requires it.

Can an airline deny boarding a passenger if they don't have a negative COVID-19 test?

Airlines must confirm the negative test result for all passengers or documentation of recovery before they board. If a passenger does not provide documentation of a negative test or recovery, or chooses not to take a test, the airline must deny boarding to the passenger.