Asiana Airlines, South Korea’s second biggest carrier, will streamline its international routes and stop operating first-class cabins in September. The carrier, which has had financial difficulties, said it would suspend operations of the nonprofitable routes from Incheon to Khabarovsk and Sakhalin in Russia and New Delhi, India in July, earlier than originally scheduled. Asiana had previously announced it would stop Incheon-Chicago flights in October. Also, business suite cabins will replace first-class cabins at prices 30 to 40 percent lower than the fares set for first-class seats, as of Sept. 1. The first-class seats have been available only on long-haul routes to Los Angeles, New York, Frankfurt and three other destinations. The changes come as the airline has been put up for sale due to significant debt.