Yeah we are more world leaders in Science and specialised technologies. Even when it comes to Spacecraft everyone thinks of the US but you would be amazed how much the US rely on us to get said aircraft off the ground. Whether it's an important electrical component or more mundane things like touch screen lacquers, the space shuttles almost had a made in Britain stamp on them! (i know a couple blew up lol!!!!!!)!
I won't argue about the US and their abilities, (or lack thereof) ... like the Chinese, they too "steal" designs, (probably the most famous being SA's Rooivalk Hellicopter design, seeing as you chose aircraft), but I digress...
My career started as an EIT on bursary through Armscor, and can safely say, (having had first hand experience), that we were streets ahead of the rest of the world in the fields of nuclear, arms and technology up to around 1996.
If we are to include SA inventors that have skipped the country, then those dates would stretch much further, hell, my own thesis was on AI in 1984, and only now has the rest of the world woken up to it .. I'm leaving out many others fields that we have led such as medicine, hydroponics, and power generation to add but another three.
South Africa HAD what it takes to be world leaders prior 94 ... this isn't a point of debate - it's a fact ... Where I'm at is; Do we still have what is required to be leaders?