Japanese airline operator ANA Holdings says it is aiming to be carbon neutral by fiscal 2050.
Last year ANA began regular flights with fuel made from food waste including fat produced in meat processing.
The operator will also use carbon credit trading and introduce new, more fuel efficient aircraft.
Companies across the ANA group emitted about 12 million tons of carbon dioxide in fiscal 2019.
Rival carrier Japan Airlines is also aiming for net zero emissions by 2050. JAL invests in a US company that developed technology for processing used clothes and plastic waste as fuel. The airline wants to introduce the technology by the end of next fiscal year.