Take context from the input text and decide on the accurate relationship between 'Singapore Airlines' and 'Singapore' from the options provided.
Options: brand, operator, headquarters location, parent organization

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