Originally Posted by
lendbz
What about entering another country that I am not a citizen of (say a country in africa), can I use my HKSAR passport over my US passport when entering that country even though I am flying from the US? The reason that I might want to use my HKSAR over my US passport for some countries is because some countries you don't need a visa with your HKSAR passport but need a visa if you use the US passport..
Yes, that is not a problem. Again, you must use your US passport to re-enter the USA (and perhaps also when checking in — see soitgoes' post above, although actually I'm not sure that it's necessary; however, it can't hurt, I guess).