BA 194 then UA 6157 at Houston
London → Houston → Atlanta
Timetable, Houston time
15:56BA 194 from London at the gate
20:00UA 6157 to Atlanta leaves the gate
4 h 04 apart on the timetable
The last days
BA 194 and UA 6157 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.