Dumb question as just a general MP member flying First out of YVR -ORD can I use the Maple Leaf lounge then? I know I can use the RCC in ORD..
Yes:
http://www.aircanada.com/en/travelin...es/access.html. "Customers holding an Executive First or Executive Class ticket are entitled to Air Canada Maple Leaf Lounge access. Please note: upgrade certificates do not provide access to the Maple Leaf Lounge."