I guess it's all in the partnership and who pays whom for lounge access. But, ironically, I had some good stops in the SWISS lounge in ZRH, whilst awaiting my AA flight (and truth be told, in the non-SWISS lounge on arrival, nice shower. But they usually charge a nominal fee..)

Once SWISS becomes a full oneworld partner, things will be a bit easier on this lounge access issue. For onow, punt