Yes, most airlines allow a 12-year-old to fly alone, but they fall into a transitional category. For many carriers, the Unaccompanied Minor (UMNR) service is mandatory for children up to age 11, but becomes optional once they turn 12. Some airlines, however, treat 12-year-olds as "young adults," meaning they can navigate the airport without a designated escort but are still subject to certain safety restrictions (such as not sitting in exit rows). In 2026, it is essential to check the specific airline's policy, as some may still require the UMNR service for international routes or have different age cutoffs in certain regions like the Middle East.