Fluffy not flat :)
Don't know if this will for you but I have very curly hair so I just add a little water comb it out and turn my head upside and fluff. Accentuating my eyes with a little more makeup doesn't hurt either. Another thought is that they now make very small (travel size) blow dryers and curling irons, in which case I'm only suggesting that you fluff up the top layer when you get to your destination.
Hope you are all enjoying your ride!