About the 1%: "1% of the population emits 50% of the commercial aviation's emission". You can keep going like that to show that it is indeed reserved to an upper-part of the society. Maybe the ultra-rich are not the only one flying, but they are responsible for a bigger part of the problem than the upper middle class.
Maybe the misunderstanding comes from the fact that we're looking at the global population. Global warming being a global problem, looking only at the population of your region is not a sufficient reasoning. I live in Switzerland, I guaranty that it's a lot more than 11% of the population that flies. At the end of the day, it's a question of moral and of fairness: do we want to live a life-style which can't be generated to the entire global population and which will ultimately lead to extreme conditions for future-generations and poorer social-classes than ours ? Is it fair that 1 person out of 10 gets to fly while the 9 others will have to pay the same consequences ? My personal answer is that it should not be a personal decision, but that politicians should keep these numbers to start making laws such as taxing kerosene to the same level as cars' fuel.
[1]: https://www.sciencedirect.com/science/article/pii/S095937802...