At Logan, DL pulls people to the front of the security line (NB distinction between security line and security lane) whenever the line is somewhat long. This has been going on since September.

There is no question that passengers who travel with any frequency at all "play" this system. Arrive at least 30 minutes before departure; linger near the newsstand; wait for DL to call forward your flight; go directly to the front of the line. I see people gathered there every morning that I transit Logan.

Is this fair: no. Is it a problem: unknown. Few people will miss their flights if the pulling forward is done equitably and consistently. But some people will spend far longer in line than others.

The seat assignment situation is interesting. I can see how an unusually lengthy security screening could cause a canceled seat, or even reservation. FWIW, at Delta at least, VCI may be a solution to this problem.