Originally Posted by
Austinrunner
If both flights are booked on the same PNR, then per the U.S. Department of Transportation, your baggage allowance for the first flight also applies to the second flight.
Apparently it does (was news to me, but I don't follow baggage regulations all that closely), but I have to wonder whether one would have to "fight" with AA to get them to provide the FC allowance on the return coach flight.