Putting a Tortoise in the Tank?

The air transport industry's attempt to burnish its 'green' credentials have not been helped by reports of widespread tinkering (https://www.bbc.co.uk/news/science-environment-50365362). In this process, the plane's tanks are filled with excess fuel in locations where it is cheap, thus saving the airline money. The increased weight, however, results in more greenhouse gases being emitted than would otherwise be produced on a trip of that distance. It seems, to some people, that the airlines are more concerned about their bottom line than about their effects on climate change. All this at a time when the very concept of regular air travel is being challenged.