(NEXSTAR) — It’s starting to warm up, which means the spring break and summer vacation travel seasons are nearly upon us. Without the necessary ID, however, you may find yourself grounded at the airport.

Come early May, you will need a REAL ID-compliant ID (which you may already have) to board a domestic flight. (It will also be necessary if you are visiting certain federal facilities or entering a nuclear power plant, but we’ll focus on the air travel part for now.)

Once the REAL ID requirement kicks in, federal agencies like TSA will be prohibited from accepting state-issued IDs that do not meet the necessary standards.