Boarding pass or ticket confirmation email?

I'm traveling through Shanghai (36 hour layover), on a joint ticket--the first leg is US airways from Bangkok, and the second is American Airlines to Denver. As i have to switch airlines, i most likely won't have the boarding pass for the second flight when i land in Shanghai. HOWEVER, i will have the ticket confirmation e-mail with seat number, etc.

Is that sufficient proof of the 'ticket and seat onward' to qualify for the 144 transit visa?