When you apply for AINP, you sign a document stating that you intend to settle in Alberta. Theoretically it is possible that if you didn't land in AB and never went to AB or that you landed in AB but left right away that they could go after you and say you lied on your application and therefore should lose your PR. To my knowledge, this has not happened to anybody or at least not yet that I have heard of but there is a possibility that it could. If I was applying to AINP, I would make sure to cover my behind by at least landing in AB and staying a couple of months looking for jobs. If you can't find a job in AB, nobody will fault you for leaving.