As I expected, the earning table of XPs is what determines the status, and it's quite crazy.
Essentially there will be no difference (as it seems) between a Z and a J for status, or between a R and a full flexible Y!



Cl. D M L1 L2 L3
Y 2 5 8 10 12
W 4 10 16 20 24
J 6 15 24 30 36
F 10 25 40 50 60

Where D = Domestic
M = Medium (<2K Miles)
L1 = Long (≥2K-<3.5K)
L2 = Long (≥3.5K - <5K)
L3 = Long 3 (≥5K miles)

Examples: A return flight from Amsterdam to New York-JFK in Business Class =
60 XP