Many travelers bought travel pillows for their flights, only to find that it is extremely frustrating to find a comfortable sleeping position with them. (businessinsider.com)
My recommendation is solely from the fact that I use this myself, and find it the best travel pillow I've come across for 7 years of traveling. (swedishnomad.com)
It's also our favorite travel pillow, even though it isn't literally a pillow. (businessinsider.com)