 When we crunch those numbers, we find that today, for example, there's 55% more severe turbulence over the North Atlantic than there was in the late 1970s, 41% more over the USA and similar figures around the world, really. So the turbulence is getting worse, but surely over the same time since the 1980s, we might have got better at monitoring it and avoiding it, going round these parts of the air with turbulence in it.