Utilize the input text as a context reference, choose the right relationship between 'Airbus' and 'aircraft' from the options.
Options: chairperson, chief executive officer, product/material produced, headquarters location

In 2014, Airbus spent about 13 billion euros on parts for its A320 family of jets, which compete with Boeing's 737 in the busiest part of the $120 billion-a-year aircraft market.
product/material produced