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What you don’t know can hurt you: European vacation edition

In our recent transatlantic airline fuel efficiency study update, we compared the fuel efficiency of 20 airlines with routes between the United States and Europe. Most of the transatlantic routes in...Finding the lowest carbon flight for a specific trip is more complicated than simply choosing the most fuel-efficient carrier.
Published 2018.12.10: Blog Post

Decarbonizing aviation through low-carbon fuels will be beyond difficult

The International Civil Aviation Organization (ICAO) appears to believe that the international aviation industry can meet its steep carbon targets under the Paris Agreement almost entirely through...It's unlikely that the aviation industry can meet its steep carbon targets almost entirely through the use of low-carbon fuels.
Published 2018.11.15: Blog Post

Kinks in the pipeline: A survey of downstream alternative jet fuels challenges

We often hear about how biofuels and other alternative fuels will be needed to decarbonize the aviation sector in the long-run. How easy or difficult will this be to achieve? There are already some...Although touted by some as necessary to decarbonize the aviation sector, logistics are still an issue for alternative jet fuels.
Published 2018.10.31: Blog Post

Can alternative jet fuels crowd out demand from the road sector?

In the aviation industry’s vision of the future, neatly laid out by the International Civil Aviation Organization, airlines can meet all of their obligations under the Paris Agreement through simple...Proponents of alternative jet fuels often ignore the reality that many other sectors have laid claims to limited bio-resources as part of their own decarbonization strategies
Published 2018.10.24: Blog Post

Death, taxes, and supersonic aircraft? Considering what’s certain, and what isn’t, under the FAA Reauthorization Act

There’s an old saw, most famously attributed to Benjamin Franklin, that nothing in life is certain but death and taxes. More recently, some have argued that the return of commercial supersonic flight...Despite a nod to supersonic aircraft in the new FAA reauthorization, CO2 and noise standards are still uncertain.
Published 2018.10.10: Blog Post

Will slow and steady win the race for alternative jet fuels?

The International Civil Aviation Organization (ICAO) relies heavily on the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) to reduce greenhouse gas (GHG) emissions from...Despite ICAO's reliance on alternative jet fuels to decarbonize the avaiation industry, production does not appear to be keeping up.
Published 2018.10.09: Blog Post

U.S. Passenger Jets under ICAO’s CO2 Standard, 2018-2038

In 2016, the International Civil Aviation Organization (ICAO) finalized a performance standard that will mandate reductions in carbon dioxide (CO2) intensity from new aircraft. The standard will be...
Published 2018.10.02: Publication

New supersonic transport aircraft: Fuel burn parity, or environmental parody?

In 2016, Sir Richard Branson, president of Virgin Atlantic Airways, announced that the Virgin Group would assist aviation start-up Boom in developing a new supersonic transport (SST) aircraft.  Boom...Boom Technologies' CEO claims the company's proposed supersonic aircraft's fuel burn will be on par with subsonic business-class travel. Will it?
Published 2018.09.28: Blog Post

Carbon intensity gap surged to a new high of 63% for transatlantic carriers in 2017

Updated study shows fuel efficiency improving an average of 1% per year since 2014, less than industry goal. A study released today by the International Council on Clean Transportation (ICCT)found...
Published 2018.09.11: News

Transatlantic airline fuel efficiency ranking, 2017

This report compares the fuel efficiency of 20 airlines operating nonstop flights between the mainland United States and Europe. It uses the same methodology as in the 2016 transpacific fuel...
Published 2018.09.11: Publication

ICAO’s CORSIA scheme provides a weak nudge for in-sector carbon reductions

The International Civil Aviation Organization (ICAO) has not yet figured out how to decarbonize jet fuels. Under the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA),...ICAO's Carbon Offsetting and Reduction Scheme for International Aviation will probably not provide a meaningful framework to transition to alternative jet fuels.
Published 2018.08.06: Blog Post

Beyond road vehicles: Survey of zero-emission technology options across the transport sector

This working paper discusses the potential of zero-emission technologies to reduce emissions from non-road transport, including aviation, maritime, off-road, and rail. These modes represent a quarter...
Published 2018.07.18: Publication

Environmental performance of emerging supersonic transport aircraft

This paper provides a preliminary assessment of the environmental performance of new commercial supersonic transport aircraft (SST). Three U.S.-based startup companies are working to develop new SSTs...
Published 2018.07.17: Publication

Reviving supersonic flight would likely have significant harmful environmental consequences, new analysis shows

New supersonic aircraft could burn 5 to 7 times more fuel than standard aircraft and exceed CO2 emission limits by 70% The re-introduction of supersonic transport aircraft (SST) into commercial...
Published 2018.07.17: News

Yes, your mother loves the flowers, but maybe not the cost of flying them in

Twice a year, at Valentine’s Day and Mother’s Day, newspapers in the U.S. often print articles informing the public where their flowers come from. While the main purpose of these stories may be to...Around Mother’s Day, media outlets often publish articles about where the flowers we buy often originate and the extraordinary efforts taken to transport them to the U.S. How much jet fuel is burned...
Published 2018.05.09: Blog Post

ICAO, why can’t you be a bit more like your sister?

Arguably, the biggest climate news so far in 2018 is the International Maritime Organization, or IMO, finally adopting a global climate framework for international shipping. In doing so, it joined...IMO and ICAO, the sister UN agencies governing international shipping and aviation, have both struck global deals on greenhouse gas emissions. But why, oh why ICAO, can’t you be more like your sister...
Published 2018.05.02: Blog Post

Did the Delta and United exit from the Persian Gulf have any effect on the market’s fuel efficiency?

In the first quarter of 2016, both Delta Air Lines and United Airlines ended all flights from the U.S. to the Persian Gulf. Delta stated that they terminated their Atlanta-Dubai route because it was...With the exit of Delta and United from the Persian Gulf market, one would expect that there was some impact on the market’s average fuel efficiency. But, is it due to a less diverse mix of aircraft,...
Published 2018.04.24: Blog Post

Policy and Environmental Implications of Using HEFA+ for Aviation

The aviation sector must confront rapidly increasing greenhouse gas (GHG) emissions and ambitious decarbonization targets. Alternative jet fuels (AJFs) could be route to decarbonizing this sector,...
Published 2018.03.21: Publication

Does it matter to your carbon footprint whether you're flying across the Atlantic or the Pacific?

In 2015, the ICCT released a white paper comparing the fuel efficiency of 20 major airlines operating in the transatlantic market-specifically, nonstop passenger flights between North America and...Two recent ICCT studies on the fuel efficiency of airlines revealed different gaps between the most and least efficient airlines operating transatlantic and transpacific routes. Could this be due to...
Published 2018.03.05: Blog Post

Size matters for aircraft fuel efficiency. Just not in the way that you think.

In our recent transpacific airline ranking, we assessed and compared the fuel efficiency of the top 20 airlines operating flights between the U.S., East Asia, and Oceana.  One interesting finding was...One might assume that the larger the plane, the more fuel-efficient it is per passenger due to economies of scale. But in the case of flights over the Pacific, conventional wisdom turns out to be...
Published 2018.02.27: Blog Post

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