Refer to the input text as context and select the correct relationship between 'Airbus' and 'aircraft' from the available options.
Options: developer, owned by, chief executive officer, product/material produced

The suit, which seeks unspecified monetary damages, also alleges that the helicopter was designed and built by Airbus Helicopters, a unit of Airbus, with flaws to its tail rotor system which malfunctioned and made the aircraft "uncontrollable in the event of a failure, especially at low speeds, hover and/or liftoff."
product/material produced