FlyerTalk Forums - View Single Post - AS Mileage Plan number too short to be accepted by British Airways check-in system
Old Nov 5, 2014 | 10:12 am
  #23  
BearX220
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Worked fine for me at a BA kiosk at LHR last week, and the miles posted within six days.

That said, if you mail in your BA BPs for manual posting/credit I've found things happen as fast or faster.
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