Thanks for the tips everyone.

I am going to Beijing, then commuting to Shanghai, then HK, then back to Guangzhou over the next 3 weeks.

I wanted to know if there was an ATM at the PEK airport, so I don't have to carry cash on the flight out, or worry about an exchange. Some airports like HK or Istanbul have Citibank or B of A ATMs, so it's fairly convenient to not worry about cash until you get there.

But thanks everyone, espec. PTravel.