Almost every disagreement you will read about Bahamas ferry documents comes from confusing two separate things:
- The law. Under the Western Hemisphere Travel Initiative, U.S. Customs and Border Protection lets U.S. citizens re-enter the country by sea on a passport card or an enhanced driver's license, and lets under-16s re-enter on a certified birth certificate. That is a genuine rule, and it is what most Bahamas guides quote.
- The carrier's condition of carriage. Baleària Caribbean requires a passport book or passport card from every passenger, with no exception for minors. A carrier is free to set conditions stricter than the legal minimum, and Baleària has.
You never meet the law at the terminal. You meet a Baleària agent at the check-in desk applying Baleària's rule — and the operator states plainly that it "is not responsible for any denied boarding due to failure to produce the proper travel documentation". A birth certificate that satisfies CBP will still end your trip at Terminal 21.
Beyond simply being the document that gets you aboard, a passport book is worth the extra outlay over the card:
- Emergency flights: if someone gets sick or injured, you will need to fly home — and that requires a passport book
- Weather changes: if a sailing is cancelled and you rebook onto a flight, the card is useless
- One document for everything: the book covers air, sea and land, so there is nothing to re-check before each trip