Flew CLT-DTW-YYZ today on Delta. I know in theory international tickets are not precheck eligible, but this thread on Flyertalk led me to try anyway.
Even though I have a high success rate on Delta I did not get the three beeps. With little activity on that thread I’m not sure if it’s the exception or the norm to get the beeps. Charlotte is set up so if you fail precheck you just fold into the Elite security line. Since I’m normally precheck eligible I figured I’d try, but I hate being “that person” who just cut all the people waiting for the TDC at the Elite line. Oh well.