I just booked a flight for Tuesday the 1st of March and was wondering if anyone could help answer my question...

I am a South African citizen and have a green card. I am flying SFO - BJS - HKG - JNB and have a 2 hour layover in each city. Because I am flying from BJS to HKG would I need a visa? I am not planning on going into the city so I would be in transit in all places.

Thanks!

RyanG