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They noted in the video that the system did say that the ticket had already been scanned.

It probably happens now and then that a ticket is accidentally scanned twice and so this message wouldn’t seem that out of place, and so they probably proceeded as normal without thinking that someone else really had already boarded with the same boarding pass.

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I would think adding a simple timestamp to the message would be helpful instead of just a Boolean “has been scanned” type of flag. With the timestamp you could at least say something like “this ticket was previously scanned at <time>.” Then from that message you would know whether it was an accidental double scan (the time being within seconds of now) or whether some time had passed, which I would hope would raise an eyebrow.

Edit: I have no idea what the actual messaging looks like. It could indeed have a timestamp. I’m just hypothesizing.

Even that’s going to have many more false positives and be annoying which will cause the attendants to be tempted to hit the “it’s fine” button.

For example, I suspect a decent number are couples/families that print multiple copies of boarding passes and two accidentally try to use the same one.

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