Hi all! I'll soon be transiting in PEK and I'm confused about what I've read here. I won't be leaving the airport, just connecting from incoming flight AY 51 (HEL-PEK) to outbound flight CX 347 (PEK-HKG) with a 3 hour layover between flights. As a USA citizen, I'm eligible for the so-called 72 hour visa-free waiver program, but I'm not sure how to proceed during the transit. Do I have to fill out some paperwork at a special 72-hour visa-free information desk before going through immigration, or do I go straight through immigration where they look at my onward flight ticket and let me through?

Any help appreciated!