If an international flight is turned around mid-air, do the passengers have to pass the immigration and customs upon arrival?

I read on https://amp.cnn.com/cnn/2021/12/28/business/delta-shanghai-flight-turned-back-covid/index.html:

Delta turned flight around mid-air, saying China's new Covid cleaning rules are unworkable.

If an international flight is turned around mid-air, do the passengers have to pass the immigration and customs upon arrival at their original departure airport? If the answer is country-dependent. I'm mostly interested in the United States.

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If an international flight is turned around mid-air, do the passengers have to pass the immigration and customs upon arrival? - Stylish happy traveler with suitcase in airport hallway

If an international flight is turned around mid-air, do the passengers have to pass the immigration and customs upon arrival? - Happy young woman standing with baggage near departure board in airport

If an international flight is turned around mid-air, do the passengers have to pass the immigration and customs upon arrival? - Unrecognizable woman with suitcase walking near airport terminal

Is immigration required for connecting flights?

A passenger who has reserved their whole journey with one booking will be able to board their onward flight without having to clear immigration. Their baggage will be transferred to the connecting flight for them, whether both flights are with the same airline or different ones.

Where does immigration happen for connecting flights?

At the Gateway Point you will arrive at domestic terminal and you may proceed to the international terminal/departure lounge to complete Immigration and Customs Check formalities. Your Baggage would be directly transferred to the International Flight.

Do airlines share information with immigration?

Additionally, airlines send passenger manifest information to U.S. Customs and Border Protection (CBP) in advance of boarding. That way, CBP can alert the airline if particular passengers should be turned away and not permitted to board.

Do I have to go through immigration for a connecting flight in Europe?

Many wonder, \u201cdo I have to go through customs for a connecting flight?\u201d This is a common question amongst international travelers, and the answer is usually \u201cno.\u201d As long as you're not leaving the airport, your bags are checked through to your final destination and you have a boarding pass for your next flight, you won ...

What is the Arrival Procedure on an International Flight?

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