Upgrade credits and domestic sectors of an international flight

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Can upgrade credits be used to upgrade a domestic sector on an international flight? I'm flying MEL/SYD rtn in two weeks and was wondering if I can fly on an international flight and upgrade to the new business class bed seats.

Thanks
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yup - no restriction based on flight number or dom/int

subject to availability of course
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Also subject to you not having a red e-deal fare class.
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