Here's a quick question for veteran KLM GUC users: any past rhyme or reason to more Z bucket inventory opening up as we approach a flight? I've been able to be flexible with my return leg, and already upgraded it, but my departure flight unfortunately has to be on a specific day from a specific airport - 3/26/24 LAX-AMS.

Interestingly, the Tuesday prior and after that week have plenty of Z last I checked, and while I know EF's 'seat map' isn't always perfectly accurate, there's only 11 of 38 business seats showing as taken. For about 3 weeks I was tracking every day about 21 separate days surrounding my flight, and I did notice sporadic adding of Z-bucket to many other days, but none on the day I want.

Anyway - just curious if others who've studied this in the past have seen more Z inventory come available within ~5 months of flight date. Thanks in advance!