Originally Posted by
EAJuggalo
It's not a secret, it's been discussed here multiple times. The policy for determining boarding order is Business Select, A-List Preferred, A-list, Anytime, Wanna Get Away Plus with EBCI, Wanna Get Away with EBCI. Those are all given out at T-36, then at T-24 any WGA+ or WGA are in order of check in.
The unknown algorithm is what determines boarding order within one of those categories. BS, specifically, has been discussed here with nothing proven yet. Most common theory is that it is based on the pax's "value" to WN, including spend, etc.