“Stow your tray tables and set your seat in the upright position, please.” You’ve heard the words before, and if you were in the middle of doing something, like drinking your coffee or watching something on your tablet, it means the fun is over. But the Airhook lets give you a cup holder, and a tablet/smartphone holder, which you can easily attach to the back of the seat in front of you. Just like that, you’ll be able to carry on your activities as the plane takes off or lands. And even when it’s in the air, you’ll free up some legroom. It’ll cost you a $22 pledge to get yours, which should be delivered by December.