KLM uses a personal code system to determine the price for a last minute upgrade (less than 24 hrs before departure) Not based on original fare -class purchase but based on previous upgrades given. When asked KLM Customer Care replied: " in order to introduce WBC to passengers with no upgrade history discounted-fares are being offered". At check in for KL604 LAX-AMS on 29 jan i had to pay $1851 for a one way upgrade from economy to business. The discounted fare was $794. Agent at check-in told
me i could not get the discounted fare because i have had a previous upgrade for the discounted fare. I have been given this anwer also on a NRT-AMS leg and on a AMS-JFK leg. The code used behind a passengers name is NDPU. (Non Discounted Paid Upgrade) Hard to understand why PLL with KL has to pay a $1000 more for an upgrade compared to a first time KL passenger.