But unfortunately, it does not. You can have a single flight number with change of gates and change of gauge - DFW-ORD-LHR, same flight number, MD-80 and 772, and it counted as ONE segment when they did not operate a DFW-LHR nonstop (but that's the mileage and segment credit you got regardless).
But if it's outbound and return, it will then count as two segments.
So, AAA-BBB-CCC same flight number, one segment, regardless of IATA or anyone else - AAdvantage is different.
AAA-BBB-AAA same flight number, two segments.
Originally Posted by
freeupgrade
I can attest from personal experience (on LAX-SJC segment run with the same inbound and outbound flight number) that I got 2 segments from it.
I am pretty confident that AA technically views a segment has "a takeoff and landing".