The Standby Tag is put on a bag when the nonrev checks in, even if the nonrev gets a seat. The reason is that it can be located and removed should the nonrev be bumped.
I have never come across an airline that will put a Standby Tag on a bag for a connecting flight for a nonrev....there might be an inhouse system within an airline but connecting between different airlines would be a hassle and I doubt it is ever done. Cheers.
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