Hello, I'm looking to book a one-way flight on T'way Airlines from Fukuoka, Japan to Seoul, South Korea for next month.

When I reach the booking section of the Japanese website (no English version), it requires various information (name, passport ID#, nationality, state). But the only states available to select are Japanese states (e.g., Fukuoka, Nagasaki Prefecture, Miyagi) and it will not accept a zip code from the United States.

Can a United States citizen and resident such as myself book a flight online with T'ways Airlines? Below is a screenshot of the page.

Thank you, in advance.