Discover is listed on the MapleLeaf Lounge entry screen at YYC. The desk agent seemed surprised I would not expect access with my ticket, so clearly some combination of Aeroplan Black/Aeroplan ticket/ 4Y Business grants entry.
Originally Posted by
TechnoTourist
Please consult the wiki above the first post where this is covered.
Until a few days ago the wiki was incorrect. Sometimes people want reassurance and simply answering the question would be better form.