Earlier today, on Twitter, United Airlines announced Direct service from IAH and O'Hare to Atlantic City starting April 1st.
Unless this is a bad, early, April Fool's Joke this is a very good thing. Previously, to get to Atlantic City you had to take Spirit and their schedule was spotty at best. (As a matter of fact, an ITA Matrix search for "lowest fares" from Houston in December 2013 and March 2014 shows no flights whatsoever)
On the wife and my last trip to Atlantic City we flew into PHL and took a NJ Transit train to AC. The bad thing about that is that we had to wake up very, very early in the AM on our way out to meet the 6 AM train back to PHL. When you're staying in a casino this is a horrible option.
Direct flights into AC are a good thing if you enjoy the area, which I do. It's a lower key version of Las Vegas with an absolutely spectacular boardwalk. If you haven't been I suggest you give it a try.
UPDATE: Well, since writing this post I've found out that United is going to use ERJ-145's exclusively for the over 3 hour flight. So it's not all that good news really. Your better Atlantic City option is to fly to PHL and take the train to AC. I wouldn't want to be in a regional sardine can for that amount of time. Oh well.