As most chatters mentionned, the BEST piece of I .D., BY FAR,
is a PASSPORT, That fits any and all requirements you might have
to face just about anywhere and at any time !!!!
As well, I N S does the deed when it comes to waiving you thru,
not the carrier ( air, sea or rail, does not matter...). The carriers have
the obligation of insuring you have the proper documents right up
front to avoid both you and THEM a lot of embarassement a few
minutes later , should I N S turn you back....
As a T A , I have always very strongly suggested that clients have a
passport, valid for at least 9 months, in their posession when they
travel, ANYWHERE, That is the best solution.
HAPPY CRUISIN '