But it was removal of the oldest and introduction of brand new. Should reduce the average to below 9. But of course the other 137 aircraft have all aged by 6 months in that time
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It might have been quite a different number if the 787s had been delivered per the original schedule at the time they were ordered, even though destined for JQ they would have allowed a few old 767s to drop off the end of the QF register.
QF's long existing strategy to purchase new and hold for a long time means their average fleet age has always been a lot higher than airlines such as SQ that have a different fleet management strategy (buy new and turn over before major maintenance is due).
And DJ have been adding E-jets recently and after their aggressive expansion over the last 5 years which has resulted in what is really quite a young fleet for an airline.