You would think hydrogen would work perfectly as a fuel for airplanes because its low amount of co2 when combusted. But this article says that it is not a valid fuel for airplanes because it is a quite hard fuel to transport. “It’s 3 times more efficient than oil but 4 times bulkier – even in its liquid state.” One of the reasons to it being hard to handle is that in liquid form it has a temperature of -253 degrees celcius. I think this article is worth checking out!
http://www.independent.co.uk/news/science/future-of-flight-fuel-for-thought-2284963.html