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.

“We believe the magnitude of our 2005 and 2011 aircraft orders helped us to negotiate favourable terms with Airbus and our other aircraft-related suppliers and service providers, which provide us with a structural cost advantage by reducing the overall costs associated with the acquisition, maintenance and operation of our aircraft,” IndiGo said in the prospectus.

Answer: product_or_material_produced