I tried the Asobo to MS Achievement, my first long flight. Sadly, the game crashed 25 miles before I landed

it can not be an general memeory problem.
I monitor the RAm usage from time to time and it has never been above 49% of the 32 GB RAM I currently have installed.

Not saying it didn’t run out of memory at the crash, but nothing that runs normal should have caused that. I also have a 32GB rolling cache on SSD on top of that.