It would be a bit of a complicated question to work out the best option I suspect. For example, qantas do a good line in carbon offsetting, but then I suspect that something like the QF9/10 route is a relatively higher polluter (compared to a higher density Dreamliner operator). Does the lack of a take off/landing at a midpoint offset the carbon footprint of flying ULH fuel requirements around? Answers on a postcard please
