Blue Lines’ Airline Contrail Index

Updated May 2024

Tier 1 - Contrail reduction targets, participation in trials, and collaborating with scientists:

DELTA AIR LINES collaborates with MIT (Massachusetts Institute of Technology) and Google Research to avoid making persistent contrails. They are also the first airline to set contrail goals: 80% reduction by 2035 and 100% reduction by 2050.

Tier 2 - Participating in trials at scale and collaborating with scientists:

AIR CANADA is involved in contrail science by participating in the In-service Aircraft for a Global Observing System (IAGOS) and committed to Airlines for America’s acknowledgment of the need to address contrail warming.

AIR FRANCE has launched a webpage detailing all the non-CO2 impacts the airline is responsible for and all the contrail management projects Air France is involved in with Météo France, CICONIA, etc. More airlines should do the same.

AMERICAN AIRLINES is involved in research with Google Research and Breakthrough Energy and is a member of the Contrail Impact Task Force. In 2023, AA is also participating in research with flight planning software company Flightkeys.

EASYJET participates in the big Ciconia project involving contrails mitigation test flights, and more. EasyJet also sent a letter to the EU urging them to include more airlines in future reporting of non-CO2 climate impacts including contrails.

ETIHAD AIRWAYS is working with software company Satavia and others to adjust flight paths to avoid making condensation trails.

HAWAIIAN AIRLINES is involved in contrail science by participating in the In-service Aircraft for a Global Observing System (IAGOS) and committed to Airlines for America’s acknowledgment of the need to address contrail warming.

ICELANDAIR is a partner airline in the EU-funded CONCERTO project, which aims to introduce non-CO2 impact management into daily operations. Icelandair has also worked with Satavia on contrail mitigation trials.

KLM is working with software company Satavia and others to adjust flight paths to avoid making condensation trails.

LUFTHANSA has long collaborated with the German Aerospace Center, DLR, and others on condensation trails research and trials.

SWISS AIR participates in the big Ciconia project involving contrails mitigation test flights, and more.

TUI is collaborating with Austrian flight planner Flightkeys and others to mitigate aviation’s non-CO2 emissions by avoiding contrails.

UNITED AIRLINES is a member of the Contrail Impact Task Force, which was formed in 2022 to allow industry players and scientific institutions to collaborate on best practices. United also runs contrails trials with Boeing and NASA.

Tier 3 - Collaborating with scientists and/or participating in small-scale trials:

ALASKA AIRLINES is a member of and economic contributor to the Contrail Impact Task Force, which was formed in 2022 to allow industry players and scientific institutions to collaborate on best practices.

AMELIA, a regional French airline, is working with Thales to bring down it’s environmental footprint - including the climate impact from condensation trails.

BRITISH AIRWAYS is participating in contrails mitigation research with Imperial College London and Breakthrough Energy, Carrie Harris, BA’s Director of Sustainability, tells in this interview.

CONDOR is one of 12 operators that have worked with British company Satavia to optimize 65 flights for contrail management and prevent surface warming, equating to over 2,200 tons of CO2e.

EUROPEAN AIR TRANSPORT (EAT) is a cargo airline that typically flies a lot at night when contrails are most warming. EAT is in a group that collaborates with the German Aerospace Center, DLR, on contrails management, which they describe here.

KENYA AIRWAYS is one of 12 operators that have worked with British company Satavia to optimize 65 flights for contrail management and prevent surface warming, which equates to over 2,200 tons of CO2e.

SOUTHWEST AIRLINES is a member of the Contrail Impact Task Force, which was formed in 2022 for industry players and scientific institutions to collaborate on best practices.

SUNEXPRESS is one of 12 operators that have worked with British company Satavia to optimize 65 flights for contrail management and prevent surface warming, which equates to over 2,200 tons of CO2e.

VIRGIN ATLANTIC is a member of the Contrail Impact Task Force, which was formed in 2022 to allow industry players and scientific institutions to collaborate on best practices.

VUELING is one of 12 operators who has worked with British company Satavia to optimize 65 flights for contrail management and prevent surface warming equating to over 2,200 tons of CO2e. This was mentioned in IAG’s Non-Financial Information Statement 2023.

Tier 4 - Publicly admitting the existence of climate impact from contrails:

ATLAS AIR is a member of the trade organization, Airlines For America (A4A), and, through A4A’s April 2024 Industry Insight, is committed to addressing non-CO2 emissions from aviation, including contrails.

FEDEX is a member of the trade organization, Airlines For America (A4A), and, through A4A’s April 2024 Industry Insight, is committed to addressing non-CO2 emissions from aviation, including contrails.

JETBLUE AIRWAYS is a member of the trade organization, Airlines For America (A4A), and, through A4A’s April 2024 Industry Insight, is committed to addressing non-CO2 emissions from aviation, including contrails.

RYANAIR has not announced participation in any specific contrail projects, but in their 2023 Sustainability Report, Ryanair calls out for more work to be done on contrails and other non-CO2 impacts. More airlines should at least acknowledge the existence of these impacts. Ryanair also sent a letter to the EU urging them to include more airlines in future reporting of non-CO2 climate impacts including contrails.

SCANDINAVIAN AIRLINES (SAS) is working with DLR, the German Aerospace Center, on a study involving sustainable aviation fuels, but also mentions that SAF reduces the climate impact of contrails.

UPS is a member of the trade organization, Airlines For America (A4A), and, through A4A’s April 2024 Industry Insight, is committed to addressing non-CO2 emissions from aviation, including contrails.

WIZZ AIR is a co-signer of the May 7, 2024, letter from three low-cost airlines to the European Commission urging them to include non-European airlines in the future reporting of non-CO2 climate impacts – including contrails.

The index is updated as needed. We have not been able to find other airlines publicly announcing they are involved in contrail research or trials, or simply acknowledging the climate challenge of contrails. Please let us know if we have missed any public announcements from other airlines.