Both times I got op-uped as SL (SFO<->HKG) were with a 2-digit BN. I never got an op-up with a single digit BN, even #1 on one occasion. Most (including me) will agree I just got lucky - I got them on occasions when I thought I had as much as a snowball's chance in hell. There's nothing outrageous about my traveling habits to have them use that; I can comfortably make SL. I could make GO if I did some extra traveling. I couldnt make DM unless they have a catastrophic c*ckup in their IT system and assign me status miles I never flew.