Last night I flew out of PHX on a red eye and I got the 3 beeps when I scanned by BP at security. Obviously the beeps meant nothing as PHX doesn't have TSA Pre-Check but I thought it was strange that the beeps are there even when Pre-Check doesn't exist. oh well. I wish I'd get pre-check when I can actually use it. It's only happened once out of LGA so far. *shrug*