DL 535 then DL 543 at Atlanta
Kahului → Atlanta → St Louis
Timetable, Atlanta time
05:21DL 535 from Kahului at the gate
15:45DL 543 to St Louis leaves the gate
10 h 24 apart on the timetable
The last days
DL 535 and DL 543 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.