Thanks, that's useful data.
I will agree with you that the yield per mile for BOS-ATH seams low. However a few observations (the first couple I already made above):
-Looking at the BOS table, I believe all the cities above ATH in number of pax have direct flights, which not only drive passenger numbers (vs. a city pair with no direct service) but also significantly drive yield. My gut feeling is that if ATH had a direct flight, yields would be better
-ATH is a very seasonal market, probably one of the most seasonal ones on the list. I suspect yields in the summer are actually much much better, which is what matters for a seasonal route
-I find the Chicago data (which is from the year before AA's ORD-ATH summer route was launched) quite encouraging. Sure, ORD is a major hub and attracts connecting traffic in a way that BOS won't, but CHI-ATH is barely bigger than BOS-ATH pax wise, it's a longer flight, yields also seem very low and yet AA is (allegedly) doing well on the route. Perhaps this is linked to my two points above
-Looking at Rome (which is not a lot closer than ATH), yields are not much better from either BOS or ORD. Yet both these markets sustain multiple carriers, especially in the summer (OK, pax numbers are higher)
-DL is making JFK-ATH year-round again from next winter. While that is a much bigger market than BOS-ATH, it's also very seasonal and they will be competing against EK. I believe this shows ATH is a market DL is looking at and believes in to some extent
In a nutshell, I wouldn't write that off just yet. We don't have very granular data unfortunately, but it seems to me like this could work on a seasonal basis.
Now that DL will be flying JFK-ATH year-round (with a second daily flight in the summer), an additional seasonal flight in the next couple of years isn't too far fetched in my view. To me the question is whether this will be from BOS or ATL (which they did fly for a few years in the early 2000s).