TP 239 then UA 1971 at San Francisco
Lisbon → San Francisco → Chicago O'Hare
Timetable, San Francisco time
14:45TP 239 from Lisbon at the gatealso EY 2796, B6 6734
22:45UA 1971 to Chicago O'Hare leaves the gatealso AC 4200
8 h apart on the timetable
The last days
TP 239 and UA 1971 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.