Where can I line up to see the sign after getting off the plane in the United States?

In this case, you will see the sign in the arrival hall of the airport.

There is usually a big screen in the entry hall, which will display all kinds of information, including entry requirements, customs declaration and other information, usually marked with the words "entry" or "exit".

In addition, in the arrival hall of the airport, there are usually immigration officials and customs officials to guide you into the right passage. If you are not sure about the direction, you can ask them. Customs staff will divert passengers according to flight number, entry purpose and other information, and guide passengers to wait in line at the corresponding team.