I bring these armrest pillow and blankets on airplanes and when traveling with my kids. The armrest conveniently holds the blanket and has a snap to attach to their backpacks for easy transfers in the airport. The blanket is just the right size for my kids and they love the penguin. I bought these on Amazon. Take a look....
https://www.amazon.com/gp/product/B018KB15AY/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
I recommend them. Families Who Travel approved!