From what it looks like on my shipping from using Hong Kong Airmail, they handed it over to USPS -- or at least I'm able to use my HK code to track it on USPS's website.
+1 to Schizoanalysis's post.
You ultimately deal with Chinese companies because they're cheap, not because they give you fast or good service. I usually just try to forget that I've ordered something, so that I don't mind the 2-3 weeks wait for my product.