UA 3924 then DL 862 at Atlanta
Chicago O'Hare → Atlanta → Boston
Timetable, Atlanta time
01:29UA 3924 from Chicago O'Hare at the gate
11:10DL 862 to Boston leaves the gate
9 h 41 apart on the timetable
The last days
UA 3924 and DL 862 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.