I just booked four domestic flights and purposely selected different options to see what happens:
* Booked flight with cash and offset during booking with cash
* Booked flight with cash and offset during booking with points
* Booked flight with classic reward and offset during booking with cash
* Booked flight with classic reward and offset after booking with points
In all cases no leaf was instantly applied. In the first 3 cases, I received an email confirmed the carbon offset had been successfully applied. I didn’t receive this for the 4th case however.
The T&C’s state the leaf will be applied after 7 days from booking so will see later in the week if this happens.
As an additional data point, when I booked a flight with cash and offset during booking with points last year, the leaf was applied as soon as the booking was confirmed.