Originally Posted by
AirborneLocksmith
I find it strange that itineraries involving partner flights are cheaper than all-AA itineraries.
My experience from UA is the exact opposite.

For me, UA+UA partner airline award tickets using UA miles for my city pairs range from being cheaper to more expensive than UA-only awards. But route combinations/selections and UA elite status/UA bank card-holding status come into play on mileage ticket pricing for UA-issued award travel.
It was only recently that DL decided to start with a mileage ticket discount feature for some DL bank card holders. I suspect we will eventually see the same come to AA bank card holders as has come to some DL bank card holders. These airlines want to keep those hamsters running like lemmings but to and on the hamster wheels.