Streetdirectory.com Happiness P/l is located in Loyang, Singapore. Located near Singapore's Changi Airport, the district is an industrial area specializing in aerospace engineering. You find large aircraft companies like Singapore Airline and General Electric Aircraft Engines located here, as well as one of Singapore's airplane hangers. Besides aircraft, Loyang is also an important area for microelectronics. Not everything about Loyang is commercial, though. There are some residential estates here, comprising mainly condominiums and other private property.