What if the flight from new york to Shanghai connects in Tokyo?

Official website at Narita Airport shows that all Delta flights take off and land at T 1 North.

After you check in in new york, you should get boarding passes from new york to Tokyo and Tokyo to Shanghai. Generally, the boarding pass from Tokyo to Shanghai does not include boarding gate information. You need to check the flight boarding information after you arrive at Tokyo Narita Airport.

After arriving at Narita Airport, follow the transit signs of international flights to the security checkpoint. After passing the security check, walk to the boarding gate according to the information screen.