Whether a 14-year-old can travel alone depends heavily on the airline's "Unaccompanied Minor" (UM) policy and the specific laws of the destination country. Most major airlines, like Delta, United, and American, allow 14-year-olds to travel as "Young Travelers," meaning the specialized UM escort service is optional but not required. However, some budget carriers like Ryanair and easyJet have a strict minimum age of 16 to travel alone, meaning a 14-year-old would be denied boarding without an adult aged 16 or 18. For international travel, even if the airline allows it, the child must carry a notarized letter of consent signed by both parents or legal guardians, stating the purpose of the trip and the contact details of the adult meeting them at the destination. Many countries, such as Mexico or those in the Schengen Area, are very strict about this to prevent child trafficking. Furthermore, most hotels and hostels have a minimum check-in age of 18 or 21, meaning even if the 14-year-old successfully flies to their destination, they would be unable to legally book or check into accommodation without a pre-arranged legal guardian or adult supervisor on site.