Ferry tank

Imagine if you were going on a long car trip, but your car didn't have a big enough gas tank to make it all the way to your destination without stopping to refuel. So, you might bring along an extra gas can in your trunk, just in case.

Well, airplanes have a similar issue when it comes to fueling up for long flights. They need a lot of fuel to stay in the air for a while, but carrying all that extra weight can make the plane too heavy to take off or fly efficiently. That's where the "ferry tank" comes in.

A ferry tank is basically an extra fuel tank that can be added to an airplane for a specific long-distance flight. It's not something the plane would use all the time, just when it needs to travel farther than its regular fuel tanks will allow. The ferry tank is designed to be lightweight and easy to remove, so once the plane reaches its destination, it can be taken off and the plane can return to using its normal fuel system.

Think of it like a little backpack that the airplane carries just for this one trip. It's not permanent, it doesn't change the way the plane works overall, but it solves a specific problem - how to fuel up for a long flight without compromising safety or efficiency.