Originally Posted by
worldwidedreamer
I have lifetime memberships in the AA + DL + UA Clubs, along with a grandfathered $100/year Presidential Plus card---and can back you up on all the above. AFAIK the Presidential Plus card is the only way to earn UA EQMs without actually flying, which is super useful in years when it makes less sense to fly UA.
In that case, starting next November, you can start using the UC when you're flying an airline other than AA. (Assuming you could physically get to it.) As of now, UA still allows their members to enter with a same-day boarding pass for any airline.