Who is considered a Non-Rev passenger?

A Non-Rev passenger refers to an individual who is traveling on a space-available basis, often associated with airline employees and their eligible dependents. This includes airline employees, retirees, and their family members who are allowed to fly without a regular fare.

In the context of this question, the definition aligns perfectly with the choice indicating an airline employee or their relative. Non-rev travel is a significant benefit for employees of airlines, enabling them to fly at little to no cost, but their travel is contingent upon available seats after all revenue passengers have been accommodated.

The other choices do not represent Non-Rev passengers as clearly. Full-fare ticket holders are paying customers who have purchased their seats outright, and a child under the age of 18 may or may not fall into the Non-Rev category depending on their relationship to an employee and the specific airline's policies. Flight attendants, while they are airline employees, do not automatically qualify as Non-Rev travelers if they are on duty or working a flight, so their status wouldn't generally be classified within this context without further specifications regarding their travel.