If you're flying in the next few days or weeks, be prepared for potential long lines at the airport as TSA starts taking a closer look at IDs. Driving the news: Wednesday is the first day a Real ID compliant license — or another acceptable document — is needed to board a commercial aircraft in the U.

The REAL ID Act was introduced in 2005 in an effort to tighten the nation's air travel security in the wake of the September 11 attacks. For now, travelers who have yet to update

Those who still lack an identification that complies with the new federal law “may be diverted to a different line, have an extra step,” Kristi Noem says.

REAL ID requirements for those flying within the United States begin Wednesday after nearly 20 years of delays.

Travelers are already adjusting to the change.