Newark Airport returns to China and Shanghai, with a connecting flight in Chicago. What should I do?

If it is a joint flight ticket of the same airline (Newark-Chicago-Shanghai), the basic process is as follows:

At Newark Airport:

When you check in, the check-in counter will give you two boarding passes, one is Newark-Chicago and the other is Chicago-Shanghai Pudong Airport. The final airport for checking luggage and luggage tags should be Shanghai Pudong Airport (airport code: PVG).

At Chicago airport:

When you arrive at Chicago airport, you don't have to leave the airport. Go directly to the next boarding Gate in the security area (Gate, the boarding pass for Chicago-Shanghai given to you by Newark Airport has the boarding gate number, so check it on the departure display of Chicago Airport). The arrival and departure of American airports are on the same floor, and they are all in the security area.

Before boarding the plane, the staff at the gate counter will check the passport.

At Chicago Airport, the terminal of American Airlines (AA) is T3, and the terminal of United Airlines (UA) is T 1 and T2. There is a passage in the security area between T 1 and T2 terminal.