BTW: Later in 2013, maybe August/September, I want to fly to MXP. I am hoping to use this same trick to book the return from LIM:
LIM-JFK(stop)-MXP.
LIM-JFK in March; JFK-MXP in August/Sept.
AA does publish a fare from LIM-MXP, and the MPM on that route is 7987, and the actual mileage is 7624, so no issue there either.