AA 3062 then UA 3907 at O'Hare
Las Vegas → Chicago → Washington
Timetable, Chicago time
05:59AA 3062 from Las Vegas at the gate
12:00UA 3907 to Washington leaves the gate
6 h 01 apart on the timetable
The last days
AA 3062 and UA 3907 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.