i had the same issue. here's the reply from 9W customer service.


The DTR system also allows Fast Track, enabling members who have a very high frequency of travel, to upgrade to a higher tier within jut six months with half the number of flights.

Tier change 6-months criteria 12-months criteria
(Dynamic Tier Review System) (Standard upgrade)

Blue to Blue-Plus 10 flights or 15,000 JPMIles Not Applicable
Blue-Plus to Silver Not Applicable 20 flights or 30,000 JPMiles
Silver to Gold 20 flights or 30,000 JPMiles 40 flights or 60,000 JPMiles
Gold to Platinum 30 flights or 45,000 JPMiles 60 flights or 90,000 JPMiles