After years of delays, people boarding flights domestically in the United States will need to present REAL ID-compliant forms of identification at airports in a major change for travelers across the country.

Starting Wednesday, most U.S. travelers without a passport will be 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 will need the security-enhanced REAL ID or an approved alternative,