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.

However, Qantas chief executive Alan Joyce has said the carrier would need to sign an agreement with long-haul pilots that allowed the aircraft to operate economically as one of three preconditions before the planes could be ordered.

Answer: chief_executive_officer: Qantas, Alan Joyce; employer: Alan Joyce, Qantas