The argument of the person posting is that the lounge was totally empty when he came at 2pm. Well, of course, it would be since the first flight from ORD with BA leaves at 5pm so only the very first passengers would start arriving as the lounge barely opened. However, the F lounge at ORD is far from big and I have often seen it very full. That included when I flew on planes that clearly weren't. The poster's argument was that the lounge agent should have let him in and then kicked him out if the lounge got too full. I think this is an unrealistic approach to take. It is both impractical for a lounge agent to need to remember/find one specific customer to kick him out if the lounge become (predictably) overflowing with passengers and it would look very bad (both for him/her and for the passenger) in the eyes of the other passengers in the area. In short, if the predicted lounge occupancy was as the lounge agent said, then I do not see anything wrong with the attitude that she took. I understand that it is not pleasant for the passenger who had a "long layover" at ORD, but I fail to see how it is BA's concern as he was transiting between a non-BA flight and another non-BA flight. Finally, I think there is a bit of a DYKWIA undertone in the complaint as he phrased it as well as a certain lack of logic in his belief that an empty lounge at 2pm predicts in any way likely occupancy a few minutes/hours later.