*If you are able to afford to fly long hall you aren’t poor by global standards (or even by U.K. standards).
I’m kind of baffled by how people think they are poor unless their income is over 100K.*
And I'm equally as baffled at how people can think that a flight from London to Dublin that costs £20 is the preserve of the rich. Or Manchester to Caen for £200 in peak season
My point is, if you massively increase taxes on flights and this drive up the cost, all you do is suppress demand at the bottom end of demand. Those people whose demand is highly elastic will respond to price increases that way.
If you're a billionaire, or a millionaire or just a wealthy middle class person, and the taxes double the cost of your holiday flights, the difference between flights for £3,000 and £6,000 aren't going to stop you, your income can dispose of that.
But if you're actually struggling and you save every month to try and afford a sun holiday in France every July with £200 flights and £150 accommodation in a caravan, then yes, doubling the cost provably means you can't do that anymore.
The rich continue to consume, the poor don't. By raising taxes you've decreased CO2 output, but you've done if by punishing the poor for daring to want (even a cheaper version of) what the rich want. It's sanctimonious and arrogant in the extreme.
My point is rather than say 'oh this produces to much CO2 let's stop people doing it' why not invest in research to find ways of making it more CO2 efficient so that people can still travel but just by producing less CO2.