Standby onward flight to USA for 72 hours visa free transit.

Hello. Just wondering i work for American Airlines as flight attendant. I am currently in the philippines but will be coming back to the USA on the 12th. I am going to be on standby passenger from Shanghai to Chicago is this going to be a problem transiting thru china considering that I don't have a confirmed onward flight? I will be a non-revenue passenger in our airline and will only be issued a confirmed seat after all revenue passengers have been accomodated. Please let me know as soon as u can. Thanks