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

Flightglobal’s Ascend Fleets database shows that CALC has a portfolio of 52 Airbus A320 family and Boeing 737s, and has a further 136 aircraft on order.
product/material produced