- 874-5403 Parking Customer Service (305) 876-7000 #4 Customer Service (305) 876-7000 Carnet & Customs Instructions Carnet users must have their carnets validated both when arriving and departing. 1) Bring Carnet and items to Public Office located in Terminal J on the 3rd Floor. 2) Go to the international arrivals exit and pick up the phone, informing an agent that you need a carnet validated Hours of operation: 24/7 Language Aid Present this language aid to be directed to the nearest Customs area in this Airport. Please direct me to the nearest Customs area. (English) Por favor, indíqueme dónde se encuentra el área de aduana más cercana en este aeropuerto. (Spanish) MIA - Miami International Airport U.S. Customs and Border Protection Information is accurate as of May 1st, 2016 but can change at any time. Please allow sufficient time to locate customs and get your carnet validated should the location of customs change due to conditions beyond our control.