Post by Tim05 on Jul 7, 2014 12:00:08 GMT -5
Went to the govt site
travel.state.gov/content/passports/english/passports/information/card/Difference-Between-Passport-Book-and-Card.html
For the card it says:
Valid when entering the United States from Canada, Mexico, the Caribbean and Bermuda at land border crossings or sea ports-of-entry. Not valid for international travel by air.
Oh, that's weird. Wonder why it would be easier to get into America via passport from those countries than the opposite.