Welcome to FlyerTalk, Newbie! How about a few more details, such as where you are leaving from?

Few airlines offer a lounge area, but on the SE Asia route, I believe if you fly SQ (Singapore Airlines) nonstop from LAX or JFK to Singapore (and then connect onwards to Bangkok), they have such an area in both economy and business class. Ask on the Singapore airlines forum about this.

Thai is either about to start, or just started flying, nonstop from JFK to BKK, maybe there will be extra space on that route.

These are very long flights and what is offered is typically called "premium economy (or business) class" and costs more than a regular ticket.

Other flights don't have this extra space in ANY class of service except maybe Virgin on some long hauls in business class (which probably is not helpful on this routing).