After going through security, you get to your boarding area and choose the business class lane. But both lines feed into a single bag check area where they dump out any drinks you got at the airport and go into a combined jet bridge. Ok whatever.
It seems some people are moved to front of the line. So I assume these are first class passengers. They go through the same search and are ushered into an exclusive first class jet bridge, which you find out later is not connected to the aircraft.
So I guess there is an advantage in being humble!