Are there really more than 9999 AA coded flights? That number seems high.

Still, the issue with me isn't so much the AAA-BBB-AAA being the same flight #, but the numbers just flat out changing. I also think AAA-BBB-CCC should not all be on the same #, but that's just me. I have a trip at the end of August, booked in mid July, with 5 segments. Of those 5, none of those flight numbers exist today for those city pairs.

Looking at the next trip I am booking today, for travel in early October, 6 segments, 2 of those do not exist today under the flight #'s shown.