It is important to note that the program is subject to availability and restrictions. Children under the age of 5 are not accepted for the program, and Frontier Airlines only accepts a limited number of unaccompanied minors on each flight Frontier Airlines Unaccompanied Minor offers Unaccompanied Minor program for children between the ages of 5 and 14 who are travelling alone. The program ensures that the child is accompanied by a Frontier Airlines representative throughout their journey until they are picked up by the designated guardian at the final destination.