AA 597 then UA 6100 at O'Hare
San Francisco → Chicago → Washington
Timetable, Chicago time
23:55AA 597 from San Francisco at the gate
06:00UA 6100 to Washington leaves the gate
6 h 05 apart on the timetable, overnight
The last days
AA 597 and UA 6100 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.