The Australian airline Qantas has certain flight change policies that control the process of changing or adjusting reservations. As of my knowledge, the cutoff is September 2021. The following is a basic description of Qantas flight change rules. Specifics may vary depending on the kind of ticket, fare class, and other considerations. This may include change fees, Fare differences, and flexibility options. https://airlinespolicy.com/cancellation-policy/breeze-airways-cancellation-policy/