don't think so.. but depending on the length of the flight and time of the day, you should be able to figure it out. If you're flying Shuttle, forget it.. they only serve drinks..
I believe that if a flight is 2 hours or more, some sort of snack or meal would be served on domestic flights if your departure time is between 6am-9am, 11am-2pm, 6pm-8pm. For some longer flights like transcon and international, you would definitely be served a meal.