International Connecting Flights at Pudong Airport?

I searched for information on-line and it was unsuccessful. I will be traveled from Bangkok, Thailand to Shianghai, Pudong airport. Then, two hours later, I will be connecting to the American Airlines going to Chicago. Do I need any type of transit visa? I am holding a US pport. I thought, it would be considered as International Connecting flights. Based on the information that I have, I will be arrival in Terminal 1, at Pudong and depart to the USA, at Terminal 2. Anyone who has the experience, please let me know where or what web site I could obtain the information. Thank you.