On top of CO2, aircraft engines emit other gases – nitrous oxides, sulphur dioxide and water – and particulate matter (soot).  These are commonly referred to as non-CO2 emissions, and it is estimated that they account for two thirds of total climate warming from flying. Yet only very few companies reflect the total impact of business flights by accounting for non-CO2 effects.  Companies should take into account the full climate warming impacts of business flying and reduce them. We found that 44 companies out of 327, up from 40 previously, are leading the way by reporting non-CO2 emissions associated with corporate flights.