Heard that as well. But, if it were the case toothpaste/alcohol bottles/food in cans, jars/other liquids in sealed containers would explode. And also, there is very low pressure on the plane (in the baggage compartment) as you are flying at a hight where there is little air. They say there are also very low temperatures (below freezing) in the luggage compartment but if that were the case, the items listed above would explode as well. Bollocks, if you are afraid, take the hydraulics off and take it with you into the plane. The bike can easily be packed into a big case. Done that before, no problems. Brakes were v's though. It is also said that shock absorbers can get damaged.