I'm not sure they could/would/want to do this...not sure who ELSE does this, but ANA both at YVR and HND had someone walking around the gate holding up a goofy but effective sign, basically telling people who could come up and it really stopped any lice gathering. I walked up and said "star gold" and she ushered me into one of the 2-3 lines that were forming based on her sign, so they had it broken down even further once she established you were in the group the sign was for. I thought it was brilliant, but slow...next thing I knew, the AC was boarded! Somehow it made it go quite quickly. Loved it.