Passport Usage

Leaving USA and entering Taiwan:
1. Fill out passport information(online or at the counter) - Enter ROC passport(USA passport info may also be needed depending on carriers) info at Airline used(i.e. China Airlines, Eva Airlines), this information is necessary when entering Taiwan with ROC passport to gain citizen status and unlimited length of stay as well.
2. Present USA passport at ticket counter to check in
3. Pass through US security check point with USA passport and boarding pass
4. Board plane with USA passport, if necessary, and boarding pass
4. Enter custom check point in Taiwan with ROC passport

Leaving Taiwan and entering USA:
1. Present ROC passport at the ticket counter to check in, USA passport may be needed to show USA entrance eligibility
1. Present ROC AND USA passports at the custom check point (to leave Taiwan as well as to get exit stamp on the USA passport)
2. Go to the special counter to get entrance stamp for the USA passport
3. Enter US custom with USA passport