Originally Posted by
Scillybear
At LAS all the AA flights depart from T1 but the lounge (not strictly a BA lounge) that BA use is located in T3, so even if it were possible to use the lounge it would not be really be practical.
AA use the D Gates in T1, which are only actually about 5 minutes away from T3 airside via a little underground train. However the lounge is bland and unexciting, so I would not waste the effort to get there. The Centurion lounge at the D gates is a far better prospect, if you have access to it.