Utilize the input text as a context reference, choose the right relationship between A350 and Singapore Airlines from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Singapore Airlines is the largest customer for the A350 XWB in East Asia, with deliveries of its 67 aircraft now on order starting in the first quarter of 2016.

Answer: operator