I have a question. It was reported in 1998 that United would code-share with Delta and American with US Airways right after Northwest and Continental Airlines announced its code-sharing agreement. However, I haven't heard anything regarding this issue for quite a long time. Someone told me once that United and Delta had a reciprocal agreement for first/business class lounge use in certain airports, but that was all… Could anyone inform me if there are any common activities going on between the larger carriers? Are the US airlines placing each other's codes in their domestic flights? I thank you all in advance for the inputs.