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Thread: Explain like I'm 5: buying up to C/J on KL
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Old Jan 25, 2022 | 8:21 am
  #2  
maalloc
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On KLM app or website during online check-in, you are very often given the option to pick a seat that's on the J cabin.

That is how upgrades are usually available. Other channels (email from time to time), check-in at airport counter, at the gate, might also be available.
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