Delta Air Lines ends interline ticketing and passenger agreements with Air China, Hainan Airlines, Shandong Airlines and Sichuan Airlines this week. The carrier wants to strengthen its partnership with China Eastern, in which it is
investing $450 million for a 3.6 percent stake, and with China Southern Airlines. Delta ended its interline agreement with Emirates in late November. Interline agreements allow passengers to book multisegment tickets across the two airlines and rebook passengers on one another’s flights during irregular operations.