The report isn't a click-bait ranking, but a thorough report on fuel consumption by airlines, including factors that affect it. Here are a few excerpts: * The

The report isn't a click-bait ranking, but a thorough report on fuel consumption by airlines, including factors that affect it. Here are a few excerpts: * The fuel efficiency gap between the most and least fuel-efficient airlines on 2014 transatlantic operations was 51%. That is roughly twice the performance gap between the best and worst U.S. airlines on domestic operations (25% in 2014). * Seating configuration and aircraft fuel burn (i.e., fuel economy of the aircraft operated) are the two most important factors influencing airline fuel efficiency; together they explain about 80% of the variation in fuel efficiency among the airlines studied. * The impact of premium seating on emissions is substantial: first class and business seats accounted for only 14% of available seat kilometers flown on transatlantic routes but approximately one-third of total carbon emissions. For carriers like British Airways and Swiss, premium seating was responsible for almost one-half of their total emissions from passenger travel. They seem to publish several interesting reports, including a similar report on US domestic flights, on diesel and electric cars. Does anyone know much about them (besides what they claim on their 'About' page)?