Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". 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.

Please refer to our earnings release, Form 10-K and Form 10-Q and other reports filed with the SEC by United Airlines Holdings and United Airlines for a more thorough description of these factors.

Answer: parent_organization: United Airlines, United Airlines Holdings; subsidiary: United Airlines Holdings, United Airlines; owned_by: United Airlines, United Airlines Holdings