Flights to get bumpier as turbulence to double Planes are designed to withstand this kind of turbulence, but if they suffer any damage it will disrupt flights. The main impact will be that flights will become less comfortable and the seat belt sign will need to be on twice as much as it currently is. Dr Williams and Dr Manoj Joshi from the University of East Anglia, analysed supercomputer simulations of the atmospheric jet stream over the North Atlantic Ocean. The study, which is published in the journal Nature Climate Change, showed that by the middle of this century, the amount of airspace containing significant clear air turblence is most likely to double. The average strength of the turbulence will also increase by between 10 per cent and 40 per cent. The aviation industry is often blamed for contributing to climate change, but the new study has shown that it will also be affected by any changes that take place in the atmosphere. Dr Williams said: "Thirty thousand feet above our heads, the jet stream is being accelerated, which is having a destabilising effect that is making air turbulence more likely to form. There are 600 transatlantic crossings every day, so a lot of fights will be affected by this.