Every flight ends the same way.
The plane takes off, your eyes get heavy, you finally drift off. Then your head tips to one side and you're awake again. A regular pillow is either too soft or gives you no support at all — so you land with a stiff, aching neck before the day has even started.
Your head tips to one side, waking you up again and again
A regular pillow flattens out after just a couple of hours
You land tired, with a stiff neck instead of real rest