FlyerTalk Forums - View Single Post - Using GUC on KE bookings - Consolidated Thread
Old Sep 22, 2018 | 7:14 pm
  #7  
MSPeconomist
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The rule that Y or B upgrades go into Z class while M upgrades go into O is reminiscent of PMNW upgrades (done on the PMNW website) using miles. IIRC intraEU upgrades on KLM also sometimes go into O class and sometimes into Z.
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