Originally Posted by MarkedMan

US is in the section of T1 right next to T2 and there is now an airside connector, or there will be soon: can't remember as I have avoided using US as much as possible. In other words, AA is there for the long haul unless VX goes through a dramatic expansion and T2 usage needs to be re-evaluated. Delta is building a Sky Club in the T1 part that is accessible, so an option will be to get the Amex plat and use the Delta lounge, as well as the centurion at LAS.