Starting Wednesday, most U.S. travelers without a passport are required to have a REAL ID to board domestic flights.After more than a decade of warning this day would come, the Transportation Security Administration says every flier over the age of 18 is expected to have the security-enhanced REAL ID or an approved alternative to pass through airport security checkpoints.

With a few exceptions, the cost of getting a Real ID-compliant license is the same as renewing your license or non-driving identification card. What happens if I don't get a Real