U.S. travelers flying domestically are required to show a Real ID at airport checkpoints. The May 7 deadline for Americans to switch to the federally compliant identification comes after more than 20 years of being delayed.

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:

Twenty years after the Real ID Act passed Congress, the oft-extended, drop-dead date requiring Star Cards to fly went into effect. Or did it?