On our last trip in May, my 7 y.o. DS had problems the instant the plane started descending, despite having had 1/2 a Dramamine before we left home (pediatrician's recommended dose). Chewing gum didn't work, drinking didn't work, opening and closing his mouth didn't work. I tried helping him "pop" his ears and that didn't work. The stewardess got him 2 plastic cups with paper towels that had been wetted and microwaved for about 10 seconds. This moist heat seemed to keep the problem from getting worse as we descended. He still had problems hearing for about an hour after we got off the plane - as if he had a bad cold and his ears were clogged - but the pain stopped. Coming back home, I gave him a full Dramamine and he didn't have any problems.