What is the relationship between 'Airbus' and 'aircraft' in the context of the input sentence.
Options: operator, director/manager, product/material produced, business division

Al Maha plans to use Airbus A320s and unspecified twin-aisle aircraft diverted from its parent company’s vast orderbook, with Qatar Airways Group CEO Akbar Al Baker pledging to build an Al Maha fleet of 50 aircraft within a few years.
product/material produced