Utilize the input text as a context reference, choose the right relationship between Lufthansa and Eurowings 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.

The union and management's dispute has resulted in 13 strikes over 18 months, with a row over retirement benefits escalating as Lufthansa began its Eurowings expansion drive.

Answer: subsidiary