DL 1012 then 7L 8587 at Atlanta
Memphis → Atlanta → Houston
Timetable, Atlanta time
12:54DL 1012 from Memphis at the gate
18:457L 8587 to Houston leaves the gate
5 h 51 apart on the timetable
The last days
DL 1012 and 7L 8587 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.