TP 4399 then BA 5769 at San Francisco
Boston → San Francisco → Chicago O'Hare
Timetable, San Francisco time
20:55TP 4399 from Boston at the gate
06:01BA 5769 to Chicago O'Hare leaves the gate
9 h 06 apart on the timetable, overnight
The last days
TP 4399 and BA 5769 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.