Re: Amazon Tech level Why would the amazons have an airplane? Because they fight harpies.
This and the above discussion about magitek give me the wonderful mental image of the Amazon Air Force flying ornithopters against a flock of harpies while shooting +1 shocking crossbows. There would be goggles.
I wouldn't be surprised if an Amazonian physicist had worked out Einstein's Theory of Relativity centuries before him, but possibly had no way to test out the theory. "Pythagorus? Ha! I came up with that theorum decades before he did!"