Well they are both almost 20 years old and on average QF do more flying per year than most on their 747's so they are most likely beyond their use by date from a financial point of view.
I can see the add now.....VH-OJK for Sale, 19 years of tender loving care by QF Engineering, a lot of k's on the clock but runs well. Pride of the fleet and preferred on Sundays as it has been a bit Holy
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J