@Alpha, It is however very common for blog sites to show a category list, or a category cloud. Visitors are familiar with the concept…
But if you wish to stick to the menu items, you could alternatively, instead of using redirects, which might hurt your SEO if not used correctly and cause an extra roundtrip by the browser, consider turning each default.md page into a blog.md page, each with a proper collection.
For example: /public_html/user/pages/02.flights/blog.md
content:
items:
'@taxonomy.category': flights