I fear this is very much the thin end of the wedge; in the UK, the lunatic fringe has got the airline industry firmly in its sights. There is something perverse in their logic, it being that, because flying may still be affordable, it should be taxed, presumably because it is the only method of transport left that has not yet been milked to the limit. In reality, the only truly "green" thing a person can do is not to be born at all.