Analyze the relationship between 'Singapore Airlines' and 'Singapore' within the context of the input sentence.
Options: manufacturer, location of formation, legal form, director/manager

Airbus Launches New Ultra-Long Range Version of the A350-900 Enables Singapore Airlines to resume non-stop flights to the US Singapore Airlines (SIA) has selected Airbus' newly launched Ultra-Long Range version of the A350-900 for non-stop flights to the US.
location of formation