Many airlines offer moist towels to their passengers during long flights. Considering the dry air inside airplanes and the pain it can cause hour after hour, you can use the towel for more than just cleaning your hands.
If you put it onto your face and breath through it. It will give you a nice warm sensation and the warm moist air coming into your lung and mouth will hydrate your respiratory system.
Once the towel cooled down a little bit you can use it for cleaning your hands and face.