Which airlines allow boarding pass connections for Thai domestic flights in Bangkok, specifically for EVA Air?

@Jo *********

interesting I've done it many times this year including four times in the past three months to go to separately bought Bangkok Airways flights to Samui, coming from separately bought flights on Cathay Pacific, Hong Kong Airlines, HK Express and Thai Airways. Yes, I recall they asked to see my last boarding pass too but always accepted the home printout of the Bangkok Airways boarding pass. Logically there is no reason they wouldn't let you since all it is is a shortcut to the Immigration Passport Control in the transit area so you don't have to go through the main immigration queue. Interesting that your experience has been different. I assume you didn't have checked baggage?

@Jo *********

perhaps if you contact the airlines you want to use and ask them instead of Google. When I book, and go onwards to Phuket the ticket shows the change in Bangkok so it's a complete connecting ticket.

@Jo *********

That is strange as SQ is still part of Star Alliance. You can book separately and still get a boarding pass for BKK transit.