Before the embarkation point was moved to the southern end of the then Ansett terminal (now T2) T3's gate 1A was used at least once that I know of for behind the scenes air side tour boarding.
I would imagine that it could be used for boarding of aircraft parked east of gate 1 (if there are any such parking positions) or to board buses for air side transportation to stand off locations if required.
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Philip
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