UA 6378 then DL 2403 at Houston
Kansas City → Houston → Atlanta
Timetable, Houston time
17:20UA 6378 from Kansas City at the gate
18:19DL 2403 to Atlanta leaves the gate
59 min apart on the timetable
The last days
UA 6378 and DL 2403 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.