Caribbean Without a Passport 2026: Puerto Rico, USVI & Closed-Loop Cruises
Updated August 2026: U.S. travelers flying domestically must use a REAL ID-compliant state ID or another TSA-accepted ID, such as a passport. For closed-loop cruises, document rules vary by itinerary, cruise line and destination; a birth certificate may be accepted in some cases, but travelers should verify requirements before departure.