Seattle airport transit process

1. Get off the plane and go directly to the immigration office when you arrive.

2. Go downstairs to get your luggage after entering the country.

You can go through the customs when you pick up your luggage. Customs is a passage, and some customs officers will check it.

After going through the customs, go to the counter to check in and get the boarding pass. The staff at the counter will tell you which terminal to board the plane.

5. Check the safety again.

6. Find the departure terminal. The connecting flight in Seattle is by train (similar to subway). When you get out of the security checkpoint, look up at the sign and you will know where the subway is.