United Airlines offers a 5% discount on all fares specifically for travelers aged 18-23. To get a United student discount, join MileagePlus and verify your student status.

The unaccompanied minor service is mandatory for a child aged 5-12 traveling without an adult. Children ages 12-17 have the option to take the UMNR service.

Join Spirit Saver$ Club® membership (costs $69.95 per year and a monthly charge will be $17.81) to get discounts on airfare, “bags, seats, and other options.

American infant rules state you can travel with infants as young as 2 days old. However, if the infant is under 7 days old, you need a doctor's approval letter.

Delta Airlines offers different types of benefits and discounts to military members, and they can range from 5% to 10% on the ticket type you have booked.

United Airlines calls them "infants," who are under 2 and allowed to travel on their parents' laps, and provides bassinets for long-haul international flights.