These are very strange reports of no food service on domestic US flights. I travel often from Denver to the East Coast on Continental or Northwest. Denver-Minneapolis has an actual flight time of about 1h40m and every morning flight serves a cold breakfast of yoghurt, bagel with cream cheese, and dry cereal with milk served in ceramic bowls and plates. For lunchtime flights to/from Detriot which has an actual flight time of about 2h55m and to/from Minneapolis the food service contains either a pasta or potato salad and a very nice sized cold sandwich, usually turkey and a large cookie of varying flavours. Very tasty! On Continental to/from Houston again breakfast is almost always a choice of hot or cold with hot being something containing eggs and cold being dry cereal. Both served with a breakfast pastry and fresh-cut fruit. For lunch or dinner, all meals I have been served to/from Houston (approx flight time of 2h) and Newark (approx flight time of 3h45m) have been hot meals with soup, salad, main entree and dessert.
Delta has resorted to severe cost-cutting measures where there is nothing but a basket full of high-calorie, low nutritional value crackers, crisps, and sweets. Anyone flying in F on DL domestically (with a few exceptions to some markets on the East Coast) already should know to expect nothing good as far as food.
My suggestion to anyone is to fly CO in F or Y if you want good meal service. If the previous poster had flown PHL-IAH-AUS, you would have had a nice meal I am sure from PHL-IAH and just beverage service on the short hop from IAH-AUS.