I booked a mileage run MIA-LAX-MIA upcoming Saturday night AA#1238 & 260. It still shows in my queue. However, when checking seat availability from the Plan Travel page for 1238, the flight did not comes up for booking for the past few days. I can do a check available seats and plug in the flight number and see there are PLENTY of seats. I know this route has flights leaving nearly every hour or two. There is a flight at 5:05pm; 6:35 pm and 9:02 pm.

Should I anticipate they plan to cancel this flight. I would need to be on this in order to get my return at 12:10 am. If they cancel I have no issue flying at 6:35, but I sure would like to know ahead of time and not end up with no upgrade and/or in a middle seat.

I just tried a different site and see this: (basically all seats not available)
AA 1238

07:50 pm
MIA
10:32 pm
LAX
Not available Not available Not available Not available