So security doesn't communicate with the airlines?
they don't, but after standing in the luggage check-in line for over 90 minutes,
I've had to show them a boarding pass for 20-30 minutes in advance of departure to get ahead/in front in security.
(i.e. just because SW decided to have only 2 luggage curbside check-in at LAX when there are 10 empty desks,
resulting in literally 90+ minutes of snaking up and down the outdoor lines,
it was
their company's luggage wait time, I've told them at that point we need to go to the front of security.)
You show them your boarding pass and they will let you ahead... of course, YMMV..