Southwest and China Airlines' partnership is an interline deal, offering joint itineraries to connect Asia and the U.S. on one ticket. Flights start in 2026.

Southwest's latest partnership with China Airlines was announced this week, when the two gathered at the International Air Transport Association's annual general meeting in India. The meeting is Southwest's first since becoming a member carrier earlier this year, and Southwest seems to be fully utilizing the networking opportunity.

Until now, it was the only major U.S. airline that allowed passengers to check two bags at no extra cost. On May 28, most passengers will start paying $35 for their first bag.