Its Best To Not Use The Blankets That The Airlines Provide
Flight crews recommend that you bring your own blankets and pillows when you are traveling on the plane as these are never cleaned and just stowed away for the next round of people to use. This is pretty disgusting and should be something that everyone knows because not everyone wants their pillow and blanket full of germs.
If you decide to bring your own pillow and blanket, be sure to wash them, as airplanes are full of germs that will be all over your sleeping accessories. Not every airline is like this, and some have fresh pillows and blankets delivered before each flight.