Utilize the input text as a context reference, choose the right relationship between Airbus and aircraft from the options. 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.

Boeing has gained invaluable technical knowledge required to design, produce and certify commercial aircraft and operates in what is essentially a market duopoly with rival Airbus for the industry's bread-and-butter single and twin-aisle commercial aircraft segment.

Answer: product_or_material_produced