I am flying into LAX on a BA flight (so, into TBIA) and then have a 6 hour stopover before I take an AA commuter flight to San Diego (from Terminal 6). Can I use an AA (or another) lounge - maybe the Admirals lounge at T4? Are you able to access an LAX terminal from which you won't be flying? I am a BA Silver/Sapphire executive club member - so presume that if I can access a lounge I can bring a guest? Thank you in advance for your help!