What is the relationship between 'Airbus' and 'aircraft' in the context of the input sentence.
Options: chief executive officer, headquarters location, chairperson, product/material produced

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