Originally Posted by
Egor
From my understanding if you want yout blue status not to expire you only need 1 flight every 365*3 days - same as for Gold. Those 4k status miles you earned to get blue will never expire unless account is closed - which is done if there is no activity for 36 months
To clarify, the 4000 status miles used to become *Silver or Blue are deducted from your status miles balance when you achieve this level.
There was also some discussion here regarding the case where Gold is not then reached within a year and whether the requirement then changes from 16000 to 20000 status miles for Gold. Unfortunately, I don't remember the conclusions about the fine points of timing.