It got a magnitude more expensive since covid. Private jets are the problem, not Kate from the UK flying to Tenerife once a year via ryan air.
Regarding jets vs mass transport, I think it is misleading to oppose them. Remove all the jets on the planet and we’ll have exactly the same sustainability trouble.
My old dad points the fault of rich people taking jets to go everywhere, and also the fault of "billion of Chineses starting to take more and more flight". His bi-monthly usage of plane for Holliday isn't worth considering through because he "has no choice, people have right to takes Holliday and we-the-world-middle-class are not the problem"