Yes, a 15-year-old can travel alone on Delta Air Lines, and for this age group, the Unaccompanied Minor (UMNR) program is optional. On Delta, the mandatory unaccompanied minor service is only required for children aged 5 to 14. Once a child turns 15, they are considered a "young traveler" and are permitted to fly as a standard passenger without any special supervision. However, parents still have the option to enroll a 15-to-17-year-old in the UMNR program for an additional fee (currently $150 each way), which provides a dedicated Delta escort, access to the "Sky Zone" lounge during layovers, and a trackable wristband. If the 15-year-old travels as a standard passenger, they must be able to navigate the airport, handle potential delays, and manage their own meals and connections independently. It is vital to ensure they have a fully charged phone, a portable charger, and a clear understanding of the "rules of the road" for air travel. In 2026, Delta continues to recommend that all young travelers carry a copy of their itinerary and emergency contact information, as well as a government-issued ID (if available) for security and check-in purposes.