In which terminal would you find international arrivals at O'Hare?

International arrivals at O'Hare Airport are primarily processed through Terminal 5. This terminal is specifically designated for international flights, which helps streamline customs and immigration procedures for arriving passengers from abroad. By concentrating international traffic in one terminal, O'Hare can effectively manage the complexities associated with international travel, including customs checks and additional security measures.

Terminals 1 and 3 are primarily used for domestic and a limited number of international flights, mainly by specific airlines. Meanwhile, Terminal 4 does not exist at O'Hare, as the airport is organized into five terminals (1 to 5). Thus, Terminal 5 is the only terminal that is directly associated with international arrivals, making it the correct answer.