Originally Posted by
eponymous_coward
Downsides:
T3 instead of T5 (though the T3 lounges aren't too shabby). By the time I get in, I'm paying for an Uber/Lyft to get home. Pay for lounge at LAS + Uber = a hotel room at ORD or LAS (and 3.5 hours is barely enough time to leave an airport and come back, so probably not going to do that- if I wanted to visit Vegas I'd do the overnight). A380 > Mid-J 744 by quite a bit (no WiFi, 744 IFE has good chance of being dodgy and not updated, cabin is smaller, A380 is just kind of nicer overall). Not 100% guaranteed to get upgrade on AS (though I've done SO many Y flights SEA-LAS-SEA it's not a huge deal, and the odds of an upgrade are very good).
I've never flown BA out of T3 and then gone to the CX lounge, but it's definitely a decent lounge