Originally Posted by
Tizzette
Card only valid instead of a passport for Mexico, correct?
It's valid for land or sea travel between canada and mexico.
But it's also useful as an ID card. You can show it to TSA when flying domestically. Or for any other purpose if you lose or surrender your driver's license.
For example, I had to surrender my driver's license to get a new license in a different state, and it was a week before I received my new ID. If I didn't have a passport card I'd be screwed if I needed an ID. (Or I'd have to carry my passport book around which is a pain)