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.

Al Maha plans to use Airbus A320s and unspecified twin-aisle aircraft diverted from its parent company’s vast orderbook, with Qatar Airways Group CEO Akbar Al Baker pledging to build an Al Maha fleet of 50 aircraft within a few years.

Answer: chief_executive_officer: Qatar Airways, Akbar Al Baker; product_or_material_produced: Airbus, aircraft