Airlines have hit back against EU plans to monitor contrails from aircraft, claiming too little is known about their climate impact to regulate them. The International Air Transport Association (IATA) says it’s too soon to implement regulations as there are still “gaps” in scientific knowledge about their impact. New EU regulations will see airlines required to measure and report non-CO2 emissions from flights from January 2025. That would include contrails, nitrogen oxides and sulphur. Contrails or condensation trails are created when ice crystals form around tiny particles of carbon emitted …