Singapore Airlines Limited (SIA) is the flag carrier airline of Singapore with its hub at Singapore Changi Airport. The airline is notable for using the Singapore Girl as its central figure in corporate branding. It has been ranked as the world's best airline by Skytrax four times and topped Travel & Leisure's best airline rankings for more than 20 years. The company has a strong presence in Southeast Asia and operates flights to over 60 destinations across the globe. It is also a member of the Star Alliance network.