You might be surprised to know that many million-milers are not super-rich, not even rich. Like this stringed-instrument guy I know, he used to be a player in an orchestra but that living is dead, and now he is privately trading violins and such, flying all over the globe to show, to buy and to sell, barely making ends meet in the process. A very weird life and very harmful for the planet, but certainly not rich.
There are also many people who fly for their job in marketing, sales or engineering, making a transatlantic return flight every two or four weeks. Certainly richer than the average human, but most are not considered rich in their own countries, and definitely not super-rich. I am familiar with more than a few of such people. Most if not all hate flying. Again, a ruinous lifestyle but one driven by making a living.
The main issue here is globalization, and the too-cheap cost of flights that does not take into account the environmental cost. If transatlantic or regional flights cost 4 times as much, you would not be seeing many of these flights, as it would not be economical to continue making a living this way. Then only the super-rich would be flying, and the above complaint would be more accurate.
What could actually make a big dent is Covid, that has taught all to do remote meetings and to find them acceptable, in fact much more productive unless an actual non-software product is to be demonstrated or transferred during the meeting.