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.

Shenzhen Airlines has struck a $4.3 billion deal to buy 46 Boeing 737s, parent Air China said last month, as the group looks to fly more routes.

Answer: parent_organization: Shenzhen Airlines, Air China; business_division: Air China, Shenzhen Airlines; owned_by: Shenzhen Airlines, Air China; subsidiary: Air China, Shenzhen Airlines; owner_of: Air China, Shenzhen Airlines