Major carriers and alliances commonly used for CHA to BKK itineraries include Delta (via ATL and SkyTeam partners like Korean Air), American Airlines (via DFW, partners for transpacific segments), United (via a U.S. hub to Star Alliance partners), Qatar Airways (via DOH), Emirates (via DXB), and other Asian carriers like ANA, JAL or Cathay Pacific when routing through Tokyo, Seoul, or Hong Kong. Delta and American offer seamless domestic-to-international itineraries when booked on partner tickets; Qatar and Emirates offer premium long-haul cabins and may provide competitive pricing from U.S. hubs. In October, weigh these factors: total travel time, layover convenience, baggage allowance, lounge access, onboard meal quality, and loyalty program benefits. For comfort on the long-haul leg, consider upgrading to premium economy or business if budget allows; otherwise, choose airlines with better seat pitch and reliable service records.