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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

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

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

Transpacific airline fuel efficiency ranking, 2016

This report compares the fuel efficiency of 20 airlines operating nonstop flights between the mainland United States and East Asia and Oceania. It extends the previous transatlantic fuel efficiency...
Published 2018.01.16: Publication

Hainan and ANA operate the most fuel-efficient transpacific flights

New study ranking 20 carriers shows 64% gap between leaders and least efficient Qantas Hainan Airlines and All Nippon Airways (ANA) ranked first in overall fuel efficiency among transpacific...
Published 2018.01.16: News

U.S. domestic airline fuel efficiency ranking, 2015–2016

Following in the footsteps of the 2010–2014 airline rankings, this study ranks U.S. domestic air carriers by their overall fuel efficiency for the years 2015 and 2016. The analysis continues the use...
Published 2017.12.14: Publication

Profits and carbon emissions surge for U.S. domestic airlines

Low fuel prices and high travel demand undercut overall fuel-efficiency gains in aircraft operations in 2015 and 2016, study finds Annual fuel-efficiency ranking of domestic carriers shows Alaska...
Published 2017.12.14: News

Transatlantic airline fuel efficiency ranking, 2014

This report compares the fuel efficiency, and therefore carbon intensity, of the top 20 airlines on transatlantic routes between North America and Europe in 2014. It is the first analysis to combine...
Published 2015.11.16: Publication

U.S. domestic airline fuel efficiency ranking, 2014

This study, the fourth in a series of yearly analyses of U.S. airlines on domestic operations, arrives as we near a potential turning point for public policy concerning aviation and the environment....
Published 2015.10.22: Publication

U.S. airline fleets due for renewal

One of the main takeaways from our 2013 U.S. airline fuel efficiency ranking is that overall U.S. domestic airlines showed no year-to-year improvement in fuel efficiency. That is not surprising. In...If the U.S. aviation sector is going to meet its 2020 carbon-neutral growth goal, airline efficiency improvements via new aircraft and engine technology will have to increase sharply from their...
Published 2014.12.05: Blog Post

U.S. domestic airlines show no overall improvement in fuel efficiency in 2013

Spirit, Frontier tie Alaska for most fuel-efficient U.S. domestic airline in 2013  American slips, with no overall improvement for U.S. airlines Alaska, Spirit, and Frontier Airlines tied as the most...
Published 2014.11.19: News

U.S. domestic airline fuel efficiency ranking, 2013

The newest release of this annual rankings report compares the fuel efficiency, and therefore carbon intensity, of U.S. airlines on domestic operations in 2013. The report also investigates changes...
Published 2014.11.19: Publication

Airline efficiency: Waiting for ICAO?

The gap between the most fuel-efficient and least fuel-efficient airlines on U.S. domestic operations stayed rock-steady at 26% from 2010 to 2012. Meanwhile, overall industry fuel efficiency improved...U.S. airlines' fuel efficiency improved about 1.1% per year in 2010–2012, short of both the U.S. government's assumptions in its GHG reduction plan and ICAO's goal. Meanwhile, public policies are...
Published 2014.05.05: Blog Post

U.S. domestic airlines show modest improvement in fuel efficiency since 2010

Top Performers Alaska and Spirit Airlines Widen Lead The overall fuel efficiency of U.S. airlines on domestic operations improved by 2.3% from 2010 to 2012, less than what is needed to meet U.S....
Published 2014.04.30: News

U.S. domestic airline fuel efficiency ranking, 2011–2012

Airlines’ in-use fuel efficiency is directly related to aviation’s climate impact. In the U.S., aviation accounted for about 11% of energy-related carbon dioxide emissions from the transportation...
Published 2014.04.30: Publication

[News release] Quantifying a gap: Fuel efficiency performance of U.S. domestic airlines

The most fuel-efficient U.S. domestic passenger airline was 26% better than the least fuel-efficient one in 2010, according to a report released today by the International Council on Clean...
Published 2013.09.10: News

U.S. domestic airline fuel efficiency ranking, 2010

Aviation plays a vital role in the modern global economy, but it is a significant and growing source of greenhouse gas emissions, and of oil demand. GHG emissions from aviation are projected to...
Published 2013.09.10: Publication

Evaluating air carrier fuel efficiency and CO2 emissions in the U.S. airline industry

In light of volatile fuel prices, rising concern over climate change, and the global economic importance of aviation, developing the capability to evaluate airline fuel efficiency is critical. Policy...
Published 2013.09.10: Publication