關於「Travel document number」標籤，搜尋引擎有相關的訊息討論：

What Is a Travel Document Number? — - MYRAblog.myrawealth.com › insights › travel-document-numberAdd Passenger - Hong Kong Airlinesm.hkairlines.com › html_en › ticket › pass_addMainland Travel Permit for Taiwan Residents - Wikipediaen.wikipedia.org › wiki › Mainland_Travel_Perm