Originally Posted by
ESpen36
The one exception to what I wrote about is rather interesting. AA has started using the same flight numbers for quick turns to smaller outstations, such as in the Caribbean (and possibly Midwest too), where an aircraft goes out and back on the same day. (MIA-BGI-MIA is all the same flight number, MIA-AUA-MIA, etc.)
I don't think this can be considered a direct flight because AA will not let you book it on the same itinerary.