The different I feel between AA nothing and AA Gold:
1. Faster Checking and Boarding (no use in DTW but great use Hubs like LAX/DFW)
2. Seems the smile from check-in agent is greater (b'cos Buz line?)
3. I found the Gold Phoneline is just like normal one, nothin special
Different between Gold and Plat.
1.OW Buz Check-in, this saved me some 30mins in LHR last time with BA.. what a "zoo" in LHR
2. Anyline AA checkin-in.
3. The Plat lIne indeed more professional (except one I encountered) and I found that they can offer better flight arrangements sometime than normal reservation line.
4. THe use of Adminal Club and any OW Buz lounge at INTERNATIONAL travel. So I never paid Admiral Club membership while using them
Cheers!