International fares are easier to get away with compared to domestic fares (main reason is that you can use multiple airliens, and any "stay" less than 24 hours is considered a "connection", while in the U.S. it is 4 hours).

If you try to engage in "throw-away" ticket on INTERNATIONAL fares (one-way), ALWAYS book TWO airlines with INCOMPATIBLE frequent flyer programs/alliance networks.

For example, on SQ (Star Alliance), the SFO-HKG-TPE fare (with the HKG-TPE segment being on any carrier you want [this is what's good about international normal fares]) is lower than the SFO-HKG fare in First Class.

You can buy a ticket with the SFO-HKG segments on SQ and the HKG-TPE segment on CX (oneworld, which is incompatible with star alliance). Try to book a connection that is >10 hours (or a long connection), but LESS than 24 hours (after 24 hours, the ticket will be priced at the higher fare of SFO-HKG).

When checking in at SFO, ask the agent to tag you bags up to HKG only (tell them you have a long connection in HKG).