On the other hand, it also seems implausible to me that the problem can be solved if everyone on the world would produce a few tones of carbon emissions each ye

On the other hand, it also seems implausible to me that the problem can be solved if everyone on the world would produce a few tones of carbon emissions each year by flying. So either flights need to become so expensive that they remain a privilege for the rich or they need to be limited in some other way. I agree that flights are perhaps not the most urgent issue. But encouraging people to fly more is still wrong. When possible, we should avoid flights.