Most airports around the United States operated smoothly as new REAL ID requirements took effect because travelers without the updated document were still allowed to move through security easily.

Standard ID cards, which are still valid for all other purposes outside of domestic flights and entering federal buildings, now feature the phrase “Not For Federal Purposes” in the top-right corner. Those who wish to obtain a Real ID must go to a DMV office. You cannot get a Real ID online, by phone, or through mail.