Just an aside on this.  I think the passport card is only good if driving into Mexico or Canada.  If flying I believe you need a regular passport.  I went on an unexpected skiing trip to Banff a few weeks ago (flew into Calgary) and had to go to Chicago to get my about to expire passport renewed before I left.  Patience and a sense of humor paid off on that ordeal.  Good thing that kindly brother-in-law lives on the near north side and drove me downtown twice.  Makes me appreciate the wilderness all the more!

Safe travels........Mike