Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

Etihad Airways invested 560 million euros in a multi-level deal comprising a 49 percent equity stake in Alitalia, a 75 percent stake in Alitalia's loyalty program, MilleMiglia, the purchase from and leaseback to Alitalia of five pairs of arrival and departure slots at London Heathrow Airport, and shareholder loans to reduce Alitalia's immediate financial liabilities.

Answer: parent_organization: Alitalia, Etihad Airways