My friend just found out the hard way about the difference between a passport ‘CARD’ versus a passport ‘BOOK’.
The U.S. Passport Card can be used to enter the United States from Canada, Mexico, the Caribbean, and Bermuda at land border crossings or sea ports-of-entry and is more convenient and less expensive than a passport book.
The passport card cannot be used for international travel by air.
Save yourself some disappointment and make sure you obtain a passport ‘BOOK’ if you plan to ever take a flight out of the United States.