AA 5216 then UA 6157 at Houston
Washington National → Houston → Atlanta
Timetable, Houston time
10:05AA 5216 from Washington National at the gate
20:00UA 6157 to Atlanta leaves the gate
9 h 55 apart on the timetable
The last days
AA 5216 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.