I'm currently *G with Air Canada Aeroplan, but will be relocating to Chicago in a few months for the next few years. I'd like to switch to United this year, but obviously want to maintain my *G benefits. If I fly/accumulate *A miles onto my United MileagePlus account, can I still get these benefits? if I get MileagePlus Silver this month, can I use benefits from both statuses?

E.g. I am flying United next week in economy class with luggage - if I accrue the miles to my MP#, can I still get the luggage fee waived and tagged priority based on my Aeroplan *G? Can I enter the lounge with my Aeroplan card, even though my boarding pass will have a different FF# on it? If I'm MP Silver, can I get upgraded to Economy Plus for MP AND get the luggage waived/prioritized AND lounge?

So many questions, so little time!

Thanks guys!