National Chinese Taipei (TW) /Embarkation USA (US)
Transit Hong Kong (SAR China) (HK)
Destination Chinese Taipei (TW)
ALSO CHECK DESTINATION INFORMATION BELOW

https://www.klm.com/travel/hk_en/pre...c/visaform.htm

Visa Informtion - Transit

Visa required, except for...
TWOV (Transit Without Visa):
Visa required, except for Those who are in direct (Air to Air
or Air to Sea) transit if holding confirmed onward bookings,
continuing their journey within 48 hours and not leaving the
transit lounge.
Warning:
- Visitors not holding return/onward ticket could be refused
entry.



SQ can interline KA, that's fine http://www.flyertalk.com/forum/singa...-airlines.html .

But can WN interline SQ? Suspect you're right about the luggage having to be picked up (and checked in again) at SFO