Originally Posted by eponymous_coward

The rules for AS awards are no changes once you've flown your first flight on the award, except for IROPS-related changes on day of travel when the operating carrier can do what they need to do to get you to your destination. Also note that minus elite status that any change for an award booked after June 2018 is $125, including rebooking in a different class of service, unless you wanted to pay F mileage in advance in the hopes F opened up (I wouldn't do this, CX availability isn't as good as in the past).