I am being offered a United Premier Travel option for an extra US$ 39 which includes "Priority security line access" at LAX. Does anyone know what this means exactly at LAX? Jump to first in line? Pass NoS-free? Zip through a special celebrity line hidden away???

Doesnīt seem like much of a deal to me in general (I donīt care much about boarding early, not being a large carry-on user), but NoS and line-free security may be worth that much.