I just joined AC using 40k miles for the 5k rebate. I think it's worth it for me because I fly outta DFW all the time and even though I don't fly AA most of the time now...i can still take a nice mile long walk to the nearest AC to rest after the long walk and then get ready for the mile long hike back to the non-AA gate
I stayed in the AC accross from B5 Monday while flying US to CLT...the walk wasn't so bad....thought about going in the PC since it's a little closer...but decided to checkout the AC instead
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Albert