For what it’s worth I’ve had no trouble opting out. A polite but firm request to the gate agent did the trick: “I prefer not to have my face scanned. Will you

For what it’s worth I’ve had no trouble opting out. A polite but firm request to the gate agent did the trick: “I prefer not to have my face scanned. Will you scan my boarding pass?” I have also opted out of body scans for TSA (before I pony’d up for Pre-Check) and out of their facial recognition check at Boston Logan.