Yes, an 11-year-old can travel alone on most major airlines in 2026, but they must use the Unaccompanied Minor (UM) service. For children aged 5 to 11, this service is mandatory on nearly all carriers like Delta, United, and British Airways. An airline staff member will escort the child through security, wait with them at the gate, and hand them over to a flight attendant. Upon arrival, they are escorted through customs and immigration to the specific adult authorized in the paperwork. In 2026, fees for this service typically range from $150 to $250 per way. Note that children this age are generally restricted to nonstop flights or very simple connections to avoid the risk of being stranded during delays. Always check the specific carrier's rules, as some budget airlines (like Ryanair) do not offer a UM service and require all passengers under 16 to be accompanied by someone 16 or older.