All air travelers entering the United States beginning January 23 will need to show passports — even U.S. citizens
Until now, U.S. citizens, travelers from Canada and Bermuda, and some travelers from Mexico who have special border-crossing cards for frequent visitors were allowed to show other proofs of identification, such as drivers’ licenses or birth certificates.
In a few cases, other documents still may be used for air entry into the U.S. by some frequent travelers between the U.S. and Canada, members of the American military on official business and some U.S. merchant mariners.