How to transfer from Chicago O'Hare Airport to China?

According to my experience, the specific procedure is:

[Premise: Your ticket belongs to the same airline, that is, both flight segments are UA or AA. ]

At the departure airport, get your boarding pass (the check-in counter will give you two boarding passes: one airport-Chicago O'Hare Airport, one Chicago-Beijing Capital Airport, or Chicago-Shanghai Pudong Airport) and check your luggage.

You don't need to pick up your checked baggage when you arrive at O'Hare Airport. The same airline will transfer directly. You don't need to leave the airport immediately to go to the boarding gate of your flight (an airport in Chicago-China).

Before boarding in Chicago, the ticket inspector at the gate will check your passport and tear off the departure part of your I-94 form (this is very important. If the check-in officer forgets to take it off, you must take the initiative to tell him to take it off. You can board the plane.

Chicago O'Hare Airport is very big. You should check the map of ORD terminal first to find out the locations of several terminals in the airport, which will be smoother. UA flights are generally in 1 and Terminal 2, while AA flights are generally in Terminal 3. On the day before departure, look up the boarding gate of your flight arrival and the next flight on UA or AA website. This is just for reference. On the same day, at O'Hare Airport, we need to check it.

Because I don't know the details of your flight, I can only change it to an airport in the United States and an airport in China.