FlyerTalk Forums - View Single Post - URGENT: Will Booking With Someone's Skymiles Notify Them?
Old Dec 14, 2017 | 8:58 pm
  #8  
gooselee
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Safest thing to do is not add the SM# until after the surprise. This will keep it out of email, app views, website, etc.

Only downside is if the person being surprised had a higher status level and adding their SM# would drive C+ upgrades or something.
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