There are too many gift card brands to list. I identified the following as potentially possible to use in Aus:
Mastercard Virtual account - but use of account funds limited to merhcants in the US
Google Play - no express restriction to US transactions or service (but I wasn't game enough to try)
Airbnb - giftcards can only be purchased by US residents (not sure how they determine that other than having a US credit crd?) but seems applicable to to any Airbnb account. Will try this method closer to my AAdv mile expiration and report back.
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