Originally Posted by
mkavie
If I switch to Mileage Plus, can I still use my Altitude status to access the lounges and receive the priority boarding?
You can still access the lounges for 2014, but if you lose the AC status UA status does not grant you lounge access on domestic US itineraries. You would have to buy a club pass for a few hundred dollars. International (including flights to canada) with UA*G do grant you lounge access.