Originally Posted by
MSPeconomist
The four airlines the OP names would presumably involve first traveling to LAX/SFO and then a TPAC to their hub, then an intraAsia flight to BKK. I highly suspect that there are other routings (surely some involve Thai) such as DL/KE to ICN connecting to KE into BKK, China Air from LAX or SEA to Taiwan (their hub) connecting to BKK, JAL connecting through HND/NRT, etc.
I'd try to avoid a separate ticket from LAS to LAX/SFO since these four airlines are unlikely to protect you across separate tickets if the domestic flight is delayed and you miss your TPAC flight. In addition to changing terminals, you would probably need to claim and recheck bags.
I've considered what you said about flying on a separate ticket to LAX or SFO. The fare was just so much higher out of LAS, substantially higher than a separate ticket, so I was trying to avoid that but I'll go back to including this leg. I was going to give a 3-4 hour window to recheck my bags.
Thanks for the information.