Dumb question on my part, but for the first time in my buisness travels, I got the secondary search on my flight from MOB-PHL. I did not see the characteristic "SSSS" on my BP. I did notice that my confirmation code ended in BNS5. Does an S in your confirmation code = a secondary search also or is this totally random now?

I just don't want the hassle going home because security at PHL is a zoo and it's bad enough to stand in the regular line.