The most important point to clear up is that airline employees do pay for their travel unless they are commuting for work. Even though they may not be responsible for covering the airfare that you would normally pay to fly, they are responsible for paying the taxes and fees on their tickets.

Airline employees do not exactly "fly free," but they have access to a benefit known as "Non-Revenue Travel" or "Standby Travel," which allows them to fly for a very low cost. Typically, employees, their spouses, children, and often their parents can fly on their own airline for just the cost of taxes and small service fees. However, the major catch is that these tickets are "Space Available," meaning the employee only gets a seat if there is one left after all paying passengers, including those on the standby list for missed flights, have boarded. If a flight is full, the employee is "bumped" and must wait for the next available flight, which can take hours or even days during peak holiday seasons. For international flights, employees often pay "ZED" (Zonal Employee Discount) fares to fly on partner airlines, which are flat rates based on the distance. While the perk is incredible—allowing a flight attendant or mechanic to fly to Paris for $50—it requires extreme flexibility and the "stress" of never knowing for sure if you will make it on the plane. Many employees use "buddy passes" to let friends fly at a discount, but these are even lower in priority than the employee themselves, often making them a risky choice for anyone on a strict schedule.