It is ironic that in the hallowed branches the mighty throw 'fuel conservation' and a wanted reduction in discretionary uplift...
Great 'policy' until one of the high branch dwellers ends up for a night with 150 odd unhappy passengers at a place not intended....The consideration of single runway operations and holding not seemingly important, but alas a diversion and missing curfew would cost far more than a kilos here or there...
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It would be logical that a suitable alternate be carried where a single runway(Adelaide) or probability due wind (Sydney) is the 'intended' destination..