Wing hooks, usually yellow, are built onto each wing of the aircraft
Planes are equipped with an intricate system of safety features in the event of an emergency.
Some features like seat belts and your under-seat life vest are hard to miss.
But other crucial safety elements go unnoticed by many passengers.
One of the tools installed on planes that can help to save your life in the event of an emergency is almost too tiny to spot.
Wing hooks, usually yellow, are built onto each wing of the aircraft.
Flight secrets: A plane’s wing hook is vital in case of emergency
They feature two small holes and sit about a third of the way down the length of the wing.
Given that commercial aircraft are designed to be as aerodynamic as possible, the existence of any sized bump on the wing makes it hugely important.
One Airbus pilot has explained the use of the wing hook in the event of an emergency landing.
The hook is used to tether one rope to the aircraft door and one to the inflatable slide, so that passengers can hold onto it as they evacuate.
In a video from the cockpit, Captain Joe explained: “In case of an emergency landing, let’s say on water, the flight attendants will want you to evacuate from the overwing exits.
Flight secrets: The plane’s wing hook is used to tether ropes in emergency water landings
“Once you’re at the door and you set foot onto the wing, you’re most likely going to fall because the surface will be wet and very slippery.
“Airbus has installed escape ropes so after opening the door one end of the rope is securely fastened in the door frame and the other end needs to be attached to this little hook.
“Another rope is hooked up in the other hole leading towards the slide.
“This little piece of metal was installed so that the escape rope can be attached, giving you a safer stand on the slippery surface on top of the wing.”
Flight secrets: Have you seen the wing hook from your plane window?
Though emergency landings on water are incredibly rare, they have been successfully performed by airline pilots.
Passengers were evacuated onto the plane wings of US Airways Flight 1549, which landed in the Hudson River on January 15 2009.
Pilot Chesley Sullenberger successfully crash landed the plane in water after both engines shut down when the aircraft hit a flock of geese.
Passengers and crew stood on the wings and emergency slides while they waited to be rescued.