I just got back from a trip to Alaska, which was fabulous! There was one blemish on my flawless experience; American Airlines does not serve any special dietary meals on domestic flights to save costs. I was fine since I had called ahead and travelled with my customary bag-o-food on the the 6-hour-long flight, but it would have been a nasty surprise if I hadn't been expecting it.
When I called American, they were sympathetic, as were the flight attendants on the aircraft, but they said this was a purely financial decision. They no longer provide kosher, diabetic or vegetarian meals either. If you think this is unacceptable, I encourage you to email or call the airline. Either way, be prepared with your own snackage!