FlyerTalk Forums - View Single Post - Supposed to be coach award; ticket says Y class; shall I credit miles?
Old Jan 26, 2020 | 11:36 am
  #6  
MSPeconomist
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IIRC KLM used to put M on the boarding pass for discounted coach fare classes (usually assigned to seats way in the back, with every seat filled) and use Y for fares that were considered more flexible.
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