Utilize the input text as a context reference, choose the right relationship between Ryanair and Michael O'Leary 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.

Ryanair boss Michael O'Leary dismisses takeover of his airline, and reveals his plans for the future

Answer: chief_executive_officer