> - Since airplanes were invented, humans have never been unable to achieve flight.
"Humans" don't mean much in that context. How many countries could build a plane? France, US (albeit they start having reliability issues), China, Russia, India, Japan, and a few others. That list [1] gives only two East-Asian countries, one South Asian and one South American countries. Every other on the list is an European country or a derivative.
Actually most of us here with a small team and sufficient funding could probably build a plane suitable for human flight given the public domain knowledge that exists. . A non insignificant percent probably have built model planes already.
Achieving competitive warplanes could be difficult. So could making something with sufficient efficiency or reliability for regulated commercial use.
Many sufficiently motivated people have actually built their own planes since the knowledge of how to achieve heavier than air flight/aerofoils widely exists.
"Humans" don't mean much in that context. How many countries could build a plane? France, US (albeit they start having reliability issues), China, Russia, India, Japan, and a few others. That list [1] gives only two East-Asian countries, one South Asian and one South American countries. Every other on the list is an European country or a derivative.
[1] https://en.m.wikipedia.org/wiki/List_of_countries_by_aircraf...