The closest I came to being an NCNS was when I arrived near the Manhattan location early and called her number (provided in email a few days earlier). No answer. No answer. No working voice mail. Kept trying.
A few blocks away, I found a Kinkos or a Staples with work-station rentals (more common then, before the spread of free wifi) and sent her emails explaining that I was there, not an NCNS, ... please send me an email or call my number ASAP ... . No reply.
After about ~45 minutes, I was leaving the area, quite disappointed, and she called me. It turns out that she had changed her cell phone service and phone number (companies made it more difficult to port numbers back then) and forgot to tell me about the new number.
We agreed to a late start. I hustled back several blocks to her hotel and things went OK. I had a very good time, but she seemed a little cold, as if the screw up was my fault. But I'd love to see her again, if schedules match up, and she doesn't change phone numbers!
If I hadn't been e-mailing her right then (meeting time + 15 minutes) to "prove" that I was there but instead waiting until that night to email ("I was there. Where were you?") I might have been falsely accused of NCNS.
Also, to me, there is a difference between a rude, inexcusable NCNS and an excusable NCNS that she explains and apologizes for later by email, text or voice. Yes, it was an NCNS but she made it up to me, big time. That NCNS should come off the list.