REAL ID Checks Are Set to Disrupt Travel at Airports Across US

US travelers are facing additional complications from a new federal identification rule that threatens to snarl operations at the nation’s airports just ahead of the summer rush.

Officials on Wednesday began enforcing a long-planned requirement that domestic passengers use what’s known as a REAL ID card, ending the longstanding practice of accepting standard driver’s licenses for air travel. Passports and certain other forms of identification, such as “enhanced” driver’s licenses, will also be accepted.

Homeland Security Secretary Kristi Noem on Tuesday warned of airport security delays as the rule goes into effect. Anyone without a compliant identification “may be ...