Americans Are Strapping Passports to Their Heads Over Fears of ICE

[fujiyamasan]

14. Here's the state dept info

U.S. Passports and REAL ID

The REAL ID Act requires IDs issued by a state to meet federal security standards. You must be REAL ID compliant to board domestic flights and access certain federal facilities. The U.S. passport book and passport card are both REAL ID compliant.

You can check to see if your current driver’s license or state ID meets REAL ID standards. The Transportation Security Administration (TSA) accepts several photo IDs when boarding domestic flights.

If you don't have REAL ID, check with your state on how to apply for one or consider applying for a U.S. passport book or card.
https://travel.state.gov/content/travel/en/News/passports/passports-realid.html

About the Passport Card

The U.S. passport card is a wallet-sized, plastic passport that has no visa pages. The card has the same length of validity as the passport book. The card is valid for land and sea travel between Canada, Mexico, and the Caribbean. The card is a cheaper alternative to the book. While you cannot use the passport card for international air travel, it is valid for domestic air travel as REAL ID.