Southwest Airlines has an Unaccompanied Minor Policy that ensures safety for children from 5 years to 11 years old travelling alone. Services include special attention, early check-in, and help at interchanges. It attracts a fee each way; parents have to fill in relevant forms. Travelers should report to the airport early to experience a hassle-free journey. Please contact Southwest Airlines for more details on booking for unaccompanied minor travel. See more : Southwest Airlines Unaccompanied Minor Policy