Global warming making long-haul flights longer

Long-haul flights are getting longer due to stronger winds caused by global warming, according to a study. US scientists linked a small increase in return-journey times of long-haul flights with an increase in the variation of the jet stream, the high-altitude air that flows from west to east. Just one minute extra flight time meant jets spent about 300000 hours longer in the air per year, burning roughly a billion additional gallons of jet fuel.