Once the initial line training requirements settle down the MEL-LAX patterns will return to a normal 36 hour transit of LAX - and flight time credits. It would not be surprising to see Melbourne crew doing at least some of the JFK’s too once they start in September; especially after Brisbane-Chicago starts.
The 78 hour transit in London will also probably be reduced to 54 once other European ports come online - more options to protect the operation in the event of diversions.
Most future options around daily services will trend towards flight time credits over time ( or no overtime whichever way you look at it!
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