Thanks.
I do have a hotel reservation (not from the airline). Is there any official documentation on Chinese Embassy that I can take a printout with me. Just in case.
This is what I found on Chinese embassy SF. This doesn't specifically talk about TWOV.
"4. Visa-free Entry
A foreign citizen can enter China without a visa under any one of the following circumstances:
1) Direct Transit
A foreign citizen who is transiting through China by air is exempted from a visa if he/she will stay only in the airport for no more than 24 hours and has a valid connecting ticket with confirmed seating on an international flight.
Citizens with passport or other international travel document, confirmed interline ticket and valid visa to the third country or region (if required) of the following 51 countries , can apply to stay in Beijing, Shanghai, Guangzhou, Chengdu,Chongqing, Shenyang, Dalian and Xi'an without visa for 72 hours on direct transit via Beijing Capital Airport, Shanghai Pudong Airport or Hongqiao Airport, Guangzhou Baiyun Airport, Chengdu Shuangliu Airport, Chongqing Jiangbei International Airport, Shenyang Taoxian International Airport, Dalian Zhoushuizi International Airport and Xi'an Xianyang International Airport. The 51 countries are: Albania, Argentina, Austria, Australia, Belgium, Bosnia and Hercegovina, Brazil, Brunei, Bulgaria, Canada, Chile, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Latvia, Lithuania, Luxembourg, Macedonia, Malta, Mexico, Montenegro, Netherlands, New Zealand, Poland, Portugal, Qatar, Romania, Russia, Serbia, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, United Arab Emirates, Ukraine, United Kingdom, United States."