I think your estimate of the CO2 tax on an individual passenger for a long distance flight as being "out of reach" of the middle class is an overestimate. In t

I think your estimate of the CO2 tax on an individual passenger for a long distance flight as being "out of reach" of the middle class is an overestimate. In terms of passenger km/l, air flight is very efficient, so spreading the tax proportionally across the passengers would not be a major impost on existing prices.