I'll agree that the US trail makes sense over the AA challenge, both because you can aim for a higher level and because the status is immediate.
But are you sure about this?
Originally Posted by
moosek
I will be flying US Airways roundtrip weekly from the midwest to Boston.
...
every flight I will make to Boston will have 1 stop usually in Detroit.
What is your home airport? US doesn't fly from DTW-BOS. You may be changing in PHL, or maybe somewhere less convenient, but not DTW.