According to Delta.com, Delta will reinstate a second daily flight between SWF and Atlanta starting February 17, 2011. The second flight to Atlanta will be on the CRJ-700 and will also bring Delta's total flights at SWF to 5 (3x DTW and 2x ATL), the schedule for the second flight will be as follows:

DL5006
LV: Atlanta 2:59 PM
AR: Newburgh 5:14 PM

Return
DL5006
LV: Newburgh 5:44 PM
AR: Atlanta 8:38 PM
CRJ-700