DL 1901 then DL 5043 at Atlanta
Indianapolis → Atlanta → Allentown
Timetable, Atlanta time
09:37DL 1901 from Indianapolis at the gate
09:59DL 5043 to Allentown leaves the gate
22 min apart on the timetable
The last days
DL 1901 and DL 5043 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.