Utilize the input text as a context reference, choose the right relationship between 'Singapore Airlines' and 'Singapore' from the options.
Options: parent organization, operator, headquarters location, brand

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.
headquarters location