Those traveling within the United States need only one valid form of identification, according to the TSA’s Real ID FAQ page. Other than a Real ID, the TSA will accept the following alternative forms of identification at security checkpoints following Wednesday’s deadline, which the TSA says are subject to change:

South Carolina airports started enforcing the use of REAL IDs at TSA checkpoints May 7. Airports like Charleston, Myrtle Beach and Columbia were ready.

The long awaited deadline for the REAL ID requirement at U.S. airports has arrived, but passengers without the security measure on their identification can still pass through security, but with a catch.