Last year I no-showed for 5 NA segments on my MONE5. It was completely fine - I called AA when I realised that the dates had passed, and they told me that the date-change rule allows for date changes after no-show segments. When I was ready to travel again, I called to make my reservations, even though the computer systems showed "flown" for each of my no-show segments, I just told the rez agent that I had no-showed and they booked me on the flights.

The only down side was that I was required to have my ticket re-validated - but this wasn't even a problem, as my TA had given me a bunch of re-validation stickers for me to fill out myself if I needed to re-book a flight