FlyerTalk Forums - View Single Post - How to "Uncheck" Yourself In for a Flight
Old May 6, 2016 | 11:44 am
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MSPeconomist
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To SDC, the phone agent will uncheck you in after you've decided on the new flight and it's available. You'll probably then need to check in again yourself for the new flight, so don't forget to do this.

If you're trying a redo to attempt to get PreCheck printed on your boarding pass, just reprinting the boarding pass (at a kiosk or ask an agent) seems to work equally well.
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