This might be insane (well, I guess not by FT standards ;-) ), but I'm thinking about possibly combining a vacation at the end of December with a need to be in Vegas for CES early January. The vacation would start in Bangkok and end in Siem Reap, Cambodia. Goal would be J (or F) for at least all longhaul. I'd be using DL miles.

My initial thinking is I could go JFK-ICN-BKK and then REP-ICN-LAS on Korean (stopover) - JFK on the way back. LAS-JFK would have to be on Delta. What I'm not sure about is what kind of award this is since I enter and depart Asia in different cities and need a US stopover on the way back. If needed I could do the award as JFK-BKK / REP-LAS and then get a one way LAS-NYC.

I'm also guessing that I wouldn't be able to combine a partner (Singapore) outbound with Skyteam inbound? It's almost a rhetorical question except I'm only 99.9% sure this can't be done ;-)

Failing all that, I'd consider missing LAS altogether. If I was just going NYC-BKK / REP-NYC, do I have significantly better options?

Thoughts from the Asia routing gurus appreciated