For many travelers, airports often feel like mysterious, daunting places full of crowded spaces and confusing signs. But behind-the-scenes, there’s a wealth of information about the fascinating world of international air travel and the people who keep the airports running. Here are some of the most interesting airport secrets few travelers know about.

When it comes to postponed and cancelled flights, stranded travelers can often find help from airport customer service staff. Many airports have on-site customer service lounges where displaced passengers can access resources and other services, such as a place to relax, access to internet, phone charging ports, and even free snacks and drinks.

The airport is also full of secrets that go far beyond the average traveler. Did you know that airports share equipment? In fact, many airports use the same security scanners and airport equipment, allowing a single company to handle the maintenance of multiple airports. This makes it easier and faster for airports to get the resources they need to keep running safely.

Airport crews often have their own, clever set of tricks up their sleeves. For instance, airport personnel may use special techniques to make ice or de-ice planes, like using a mix of hot water and salt to quickly and safely remove any icy patches on the wings and fuselages.

Another behind-the-scenes airport secret that few travelers get to witness is the airport’s hidden network of underground tunnels. A web of tunnels can be found beneath the airport that allow workers and vehicles to move around without getting in the way of passengers.

Last but not least, airports often employ wildlife hazard control. To prevent wildlife collisions, airports hire teams of people to monitor the area and implement methods to scare the wildlife away, such as sound cannons and other nonlethal methods.

Whether you’re new to air travel or you’ve been hitting the skies for years, it’s fascinating and eye-opening to learn about the behind-the-scenes secrets of the airport world. And the next time you fly, you might feel like you’re an insider.