Lines moved quickly and exceptions were made for travelers without their upgraded driver's licenses or other valid identification documents, which were technically required for air travel starting Wednesday, following a 20-year roll-out by the U.S. government.

Airport and security officials reported "smooth" operations on Wednesday when passengers were first required to have an updated REAL ID to fly.

After years of delays, the REAL ID deadline officially arrived, and travelers across the country are navigating new rules and last-minute surprises.