Hi Kusho,
Do you mean that if I have Canadian PR Card then I do not need any transit visa,
I am planning to go first to Canada by using my Canadian PR card (to take care of something), then from there I will be travelling Abroad for 2/3 weeks and will return to USA by using AP before it expires. I guess I have to submit my I-94 at Canadian border to Canadian Immigration so that there would a record of my departure from USA. Is there anything I need to do besides that, any feedback from anyone would be appreciated. Thanks