CI 9329 then UA 5567 at San Francisco
Calgary → San Francisco → Seattle
Timetable, San Francisco time
15:50CI 9329 from Calgary at the gate
16:17UA 5567 to Seattle leaves the gate
27 min apart on the timetable
The last days
CI 9329 and UA 5567 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.