Specifically, here are the flights with closest arrival time to the original flight. Looks like there is currently decent availability. There are also a number of earlier flight options through SLC, MSP, and DTW.

Thur, Nov 26, 2009 Delta Air Lines 124 Equipment: 757
Booking class: K/Coach
Fare basis code: KA21A0UJ
Depart: 9:30 AM Las Vegas, NV (LAS)
Meal: Breakfast
Arrive: 4:28 PM Atlanta, GA (ATL)
Approx. flight miles: 1,744
Duration: 3 hr 58 min
Time between flights: 0 hr 52 min
Thur, Nov 26, 2009 Delta Air Lines 1838 Equipment: MD-80
Booking class: K/Coach
Fare basis code: KA21A0UJ
Depart: 5:20 PM Atlanta, GA (ATL)
Meal: None
Arrive: 6:50 PM Cincinnati, OH (CVG)
Approx. flight miles: 373
Duration: 1 hr 30 min

Total duration: 6 hr 20 min