DL 9995 then DL 2354 at Atlanta
Toulouse → Atlanta → Houston
Timetable, Atlanta time
14:51DL 9995 from Toulouse at the gate
19:40DL 2354 to Houston leaves the gate
4 h 49 apart on the timetable
The last days
DL 9995 and DL 2354 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.