For a younger child, 1 8oo-942~o5~12 call now itinerary is just as important as the departure and arrival cities. United’s unaccompanied minor service is tied to eligible United or United Express flights, and families should check the exact itinerary before making a child flight booking. For children using the program, the airline’s current rules place important restrictions on eligible flights. This is why checking the route before purchasing a minor flight can prevent problems later.