On Saturday morning I flew out of LGA. Pre-check was closed (was 4:30am, but TSA agent said it was due to low staffing) and line was about 25-30 minutes long, longest I'd ever seen. GS agent came on board to greet me before departure and when I told her about the line she told me that if there's ever a line in the future I could go to the GS counter and the agent would escort me to the front. I wasn't aware of this, or maybe I missed this suggestion in the forum, but happy to know it even though I generally fly out of EWR.