Between flights today at O'Hare, I decided to kill some time during my 4 hour layover at the Admirals Club on Concourse H. I was transferring from a domestic AA flight to a code share Etihad flight to Abu Dhabi in paid business class. I was traveling on an AA boarding pass (Flight #6007,) purchased on AA.com, and earning full AAdvantage miles. When I tried to enter the Club, I was told "we don't support that airline, you can't enter." I pointed out the above and in return was offered the chance to purchase a a day pass for $50.00. I passed on the offer, figuring I had already given AA enough money with the biz. class ticket. I ended up just waiting around until the Etihad ticket counter opened 90 minutes later and getting their lounge invite. Is it me, or does AA's lounge policy sound nuts?