Not really sure what the problem is. If you book a flight in J on an 787 to LHR for example its 30-50% more adjusted for mileage compared to MIA-LIM. And while I think it is a ridiculous that Y has no personal IFE on the 767 (and the electrical excuse is a flat out lie), many trans-con flights similar in flight time don't have in seat IFE or power either, so LATAM is not being singled out here. Sorry but how many passengers complaining about the 767 would actually pay more to fly on a newer aircraft? Not many.