UA 1252 then AA 4148 at O'Hare
Washington → Chicago → Cleveland
Timetable, Chicago time
11:38UA 1252 from Washington at the gate
18:25AA 4148 to Cleveland leaves the gate
6 h 47 apart on the timetable
The last days
UA 1252 and AA 4148 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.