Originally Posted by daslax
Related question: I am comfirmed on a 6pm LAX-SFO flight and want to standby for a morning flight - if I show up with on online BP for the 6pm flight 8 hrs earlier, will I have any problem with TSA letting me through that early?
TSA (or the BP/ID checkers ?) may have a problem with you getting to the gate area outside of the timeperiod you would be expected for your flight ....
For example in BOSTON there are big electronic signs before the checkpoint showing the "acceptable" departure time.