Yes, private planes must adhere to the same international laws as commercial flights, meaning they absolutely go through customs and immigration. However, the experience is vastly different from the long lines at a main terminal. Private jets usually land at a Fixed Base Operator (FBO)—a private terminal. Depending on the airport and country, customs officers may either come out to the aircraft to check passports on board or meet passengers inside the FBO lounge. In some cases, such as traveling between the U.S. and Canada, pilots can utilize programs like CANPASS or the CBP ROAM app to clear customs virtually or via a quick phone call, provided everyone on board is pre-approved. While the process is significantly more discreet and takes minutes rather than hours, failing to stop at a designated "Port of Entry" can lead to severe fines or the seizure of the aircraft.