Because, despite their CEO's primarily being the one's who have come out and said there is too much domestic capacity, they're going to go right ahead and do exactly what they've planned all along. They're the one's who know what they're doing and have a "plan." It's the ULCC's that are screwing everything up and weakening their earnings. How horrible it is to actually have a little competition in these markets...

If AA sees demand falling off, then this is the right move and will make the airline more nimble. If it doesn't, they're ceding a ton of the market to them in fear of lower margins.