Aa288 connecting Boston

Chicago is your first stop in the United States and your "entry point" into the United States. People must get off the plane and check their passports, visas, etc. through the immigration office. Behind the immigration office, all checked baggage must go through customs inspection and then be shipped behind the customs. Others look at the screen. The next flight is at that terminal/boarding gate, go to the second floor, take the tram, go to the terminal, go through the security check and go to the boarding gate. Two hours, entry and transfer. Just enough time. It seems that I will take the same flight number, but change planes (738=737-800).