Hanoi, April 4 -- The United Airlines plans to add daily flights to Vietnam and Thailand in October, further expanding the network for the US-based carrier that already has the most Asia service, reported CNBC. In the expansion, its airplanes from Los Angeles and San Francisco that are headed for Hong Kong (China) will then go on to the two new destinations - Thailand's Bangkok and Vietnam's Ho Chi Minh City, with service set to begin on October 26. On October 25, United Airlines plans to add a second daily nonstop flight from San Francisco to Manila, the Philippines, and on December 11, it will launch nonstops from San Francisco to Adelaide, Australia, which will operate three days a week. The news site noted that the carrier has been ad...