Singapore Airlines will restore nonstop service to San Francisco next month, the carrier announced. On Dec. 17, it will begin service between San Francisco and Singapore three days per week on a two-class, Ultra Long Range Airbus A350-900 aircraft with 67 Business Class seats and 94 Premium Economy seats. Additionally, Singapore on Dec. 2 will expand its Los Angeles service to five days per week. The carrier restarted service to New York earlier this month.