So THAT'S What The Hook On Your Airplane Tray Table Is For?

Turns out airline tray tables can carry more than just food crumbs and germs. That little hook attached to some tray table knobs is actually a coat hook, Lifehacker points out.

Of course, it works for hanging items like earphones and sweaters, too. On some plane seats, you’ll find the coat hook next to your tray table or on the side of the seat instead. Others don’t have a hook at all, sadly.

Whether or not a plane has a coat hook is a matter of airline preference. You see, airlines order their planes from manufacturers like Boeing, then customize the interiors with the help of companies like Rockwell Collins, which manufactures airplane seats.

Indeed, that tray table hook is “a coat hook option that some airlines take” when designing their cabins, a spokeswoman for Rockwell Collins told HuffPost.

The more you know.