Each year, they have asked a representative sample of more than 4,000 people whether they agree or disagree that "the price of a plane ticket should reflect the environmental damage that flying causes, even if it makes air travel much more expensive".
The proportion of those agreeing rose steadily from 36% in 2004 to 49% in the most recent survey, in 2007, while those disagreeing fell from 34% to 28%, with the rest undecided.
Analysts from the National Centre for Social Research (NCSR), which conducted the surveys, said: "We found remarkably low levels of opposition to the idea that ticket prices may have to rise in order to offset environmental damage. This remains the case among current flyers as well as non-flyers and holds across the political spectrum."
Picture: courtesy SA Tourism