Originally Posted by
sbagdon
When people look at my signature and ask what that is, my response is... legally binding.
By land, or sea. Not by air.
http://travel.state.gov/passport/ppt...card_3921.html
Question 2:
Why can’t I use the passport card to fly to Canada, Mexico, the Caribbean, or Bermuda?
The passport card was designed for the specific needs of northern and southern U.S. border communities with residents that cross the border frequently by land. The passport book is the only document approved for international travel by air.
Yet if you're traveling to Bermuda frequently by sea... more power to you.
When the US Passport Card came out a couple of years ago, a Canadian minister said during an interview that they wouldn't mind accepting the card for entry by air. However, it's the US government that excluded this possibility by printing this restriction on the card.