• The table below shows the three airlines operating in the UK which have the highest CO2 emissions, based on the most recent data published by airlines.

    Airline Total CO2 emissions Efficiency Source Year
    United Airlines 33.2 million tonnes 0.179 (emissions / 1000 RPM) Eco-Skies Report 2010
    Lufthansa 27.7 million tonnes 9.84 kg CO2 per 100 passenger km Sustainability Report 2014 2013
    American Airlines 26.8 million tonnes Not available Environmental Data 2011