AC 3344 then UA 3912 at San Francisco
Portland (Oregon) → San Francisco → Houston
Timetable, San Francisco time
12:58AC 3344 from Portland (Oregon) at the gate
23:00UA 3912 to Houston leaves the gate
10 h 02 apart on the timetable
The last days
AC 3344 and UA 3912 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.