Originally Posted by
best
Thank you: while interested in general about this question, here is specific example: SNA-ORD-MIA. Depart at ORD, and reboard same plan about one hour later. One AA flight number. Posted only 2,331 miles.
If it is the same flight number, you will only get the overall miles, and not for each segment. This has been in place for a long time. It actually has nothing to do with whether it's the same actual plane or not- just the same flight number. It also only gives one segment. On the plus side, it only requires the number of stickers for the direct mileage.
So, to answer your questions:
Why would AA do that? Because that's their policy.
What to do? Nothing.
Cheers.