The TSA says about 1 in every 5 flyers are showing up to airports without a Real ID, passport or other compliant ID, meaning they could have major travel troubles when the Real ID requirements take effect next week.

If you still haven’t made a trip to the DMV for your REAL ID, time is running out. Your domestic air travel could be delayed if you don’t have an accepted form of identification at TSA checkpoints next week.

REAL ID compliance has varied by state. Federal agencies warn that delays at airports for security protocols and identification checks could be commonplace.