Take context from the input text and decide on the accurate relationship between 'Airbus' and 'aircraft' from the options provided.
Options: owned by, subsidiary, owner of, product/material produced

“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.
product/material produced