https://flyforair.com/blog/how....-do-i-upgrade-from-e
How do I upgrade from economy to Business Class at KLM ?
Are you unhappy with the flights you have scheduled with KLM Airlines? Does your KLM ticket need to be upgraded? Yes, you can read the submission's information on How do I upgrade from economy to Business Class at KLM ? or give the live agent a call at OTA: +1-800-880-8132. The agents are trained and accessible around-the-clock to assist you with upgrading your ticket.
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