I guarantee there’s more people who might like to travel than planes and fuel to move them. Expanding the sector requires a variety of inputs, which themselves are in shortage.
There will always be some things that will be scarce, yes, like say space travel, that will have to be dealt with by other means. The point is that there are more than enough other things that can be provided in abundance to give everyone a high standard of living. And once the inefficiencies of the current system are removed, even many scarce things (like air travel) will be far more available than they are now.
Please do. I did read through that page and a few other places on the website. It explains that it’s a new economic system, but not how it works.
There are a couple pages that go over the basics (e.g. The Energy Certificate), but if you want more details I just need a way to get a couple of pdfs to you.