Are you curious to know about the policy for minors for Delta Airlines? Solo unaccompanied minors on delta flights are allowed to board, between the age of 5 to 14 years. Children below 5 are not allowed to travel alone upon the responsibility of the airlines. The parents or guardians of the children whose tickets have been booked have to show a few documents at the airport. These documents include a Photo ID (license, birth certificate, and passport), Address (as mentioned in the ID), Contact phone number of the parents/guardian on both sides, and A copy of the photo ID of the parents/guardian at the departure as well as arrival airport.