"Reserve a time for TSA screening" and forego PreCheck screening? Or have they started by setting it up so those with PreCheck on boarding passes can use the LAX Fast Lane program to get the normal PreCheck screening at the screening checkpoint even with use of the LAX Fast Lane Program? Or are they going to do a "PreCheck light" kind of thing from the start there (for those with PreCheck boarding passes while using the Fast Lane program)?

SEA and BOS did something like this earlier in the year, but I haven't been at either airport when they were piloting this kind of thing.

Copenhagen Optimization