For the last several years, i had 100% success as a DL or NW platinum using either the central or the north AS premium line. Last month, AS told the line monitors to enforce 100% AS MVP (or better) only. Yet, the south checkpoint where DL is at, it states the AS MVPs are welcome to use the line.
I asked at the AS boardroom and they confirmed that it is a new policy for the premium lines that they are ONLY for AS MVP or first class. I've been meaning to write to Anderson about it, but haven't had the time.
One more excellent benefit with code sharing with AS.