With the REAL ID deadline less than three weeks away, the TSA and airlines are preparing travelers for a new reality at airport security checkpoints.

REAL IDs will be required starting May 7 in order for U.S. air travelers to fly domestically. Travel delays may result for those who are unprepared — and for others as well. Here's why.

Travelers wanting to use state-issued ID must be Real ID compliant by May 7 or they may not be able to board their flight.