Flying on aa out of LAS 3 times, I went through the pre-check line, ditto for jfk domestic 2 for 2; on 2 intl flts out of jfk no pre-check--but from various postings here intl flts don't qualify.
Shortly before pre-check was set up at jfl, when they scanned my bp, I heard the pre-check beeps--so I would have been able to use pre-check if it were in operation.