“Immigration” is about the people traveling from one country to another. It's sometimes called “passport control” or “border control” depending on the airport. “Customs” is about the stuff those people are carrying with them.
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Officials will review your required passenger travel documents (passport, visa, green card, disembarkation card (provided by a flight attendant during flight), immunization documentation, letters of confirmation or support, etc.)
Usually, you go through customs when you exit the airport at your final destination. However, if you have a layover in a different city in your destination country, you may need to go through customs before your connecting flight.
Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
For the vast majority of passengers the immigration process only takes a few minutes, though lines can get long if many international flights arrive around the same time. Once you land, just follow the signs (and other passengers) to the immigration area.
Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
Officials will review your required passenger travel documents, such as passport, visa, green card, disembarkation card (provided by flight attendant during flight), immunization documentation, letters of confirmation or support, etc.
Everybody who enters the United States has to pass through a CBP (Customs and Border Protection) checkpoint. Among other things, that will involve completing a Custom Declaration Form 6059B.
Mobile Passport Control (MPC)A secure and free application that allows you to store your travel documents, photos and customs declaration from your mobile. This will allow you to go to an express line at passport control inspection upon your return to the United States from any international destination.
Passport control, that will depend, but you would need to pass through it again to be readmitted to the country and some places may not allow you that. What are the things that you cannot bring into an airport but can carry them onto your flight from outside of the airport's security check point area?
For international layover flights booked on one airline, two hours is often recommended to make your connection. For international flights on different airlines, the connection time will need to be even greater as you may have to change terminals between the two flights.