But some researchers and environmental groups - supported by companies claiming to be able to help solve the problem - say airlines have done too little to handle the issue.
According to such experts, research shows that non-CO2 emissions can actually be more harmful than carbon emissions.
New European Union rules on emissions trading that will come into force in 2025 will force airlines to track and report their non-C02 emissions.
Airlines have pledged to reach net-zero carbon emissions by 2050, mainly by adopting Sustainable Aviation Fuel (SAF), scarce alternative fuels made from renewable sources - like biofuels or synthetic fuels - that are used to power aircraft.
Based in Cambridge, England, SATAVIA says that by focusing so heavily on carbon emissions, the industry will be paying more money for a solution that could take years to have an impact.
Persons:
Roger Teoh, SATAVIA, Adam Durant, Padraic Halpin, Tim Hepher, Aurora Ellis
Organizations:
International Air Transport Association, Imperial College London, New, Union, Airlines, Sustainable Aviation Fuel, Reuters, Thomson
Locations:
Istanbul, Paris, contrails, Cambridge, England