flight tracking not showing anything since august

I just booked flights on American Airline for Christmas time when my sister called and said not to book American because of all the cancellations. Well, too late for that, can’t cancel. So I looked up all my flight numbers to see how often they are being cancelled. Luckily none have been since June. But, one flight number does not have any information after August. What could be the reason? I just joined this page and don’t know much about it.

What’s the flight number?