DL 9977 then DL 2516 at Atlanta
Detroit → Atlanta → West Palm Beach
Timetable, Atlanta time
12:12DL 9977 from Detroit at the gate
16:19DL 2516 to West Palm Beach leaves the gate
4 h 07 apart on the timetable
The last days
DL 9977 and DL 2516 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.