Operation Blue Skies is a trial to reduce contrails (the high altitude cloud tracks created by jet aircraft in cold humid conditions that are 40% of flights global heating contribution) by changing their altitude. It is running for the next 2 winters in Shanwick airspace using AI to calculate where contrails might occur and reroute planes. https://www.ati.org.uk/news-events/news/operation-blue-skies-takes-off-landmark-oceanic-airspace-trial-to-test-ai-driven-contrail-avoidance/