AA 3105 then AS 1757 at Seattle
Chicago O'Hare → Seattle → Las Vegas
Timetable, Seattle time
20:14AA 3105 from Chicago O'Hare at the gate
21:05AS 1757 to Las Vegas leaves the gate
51 min apart on the timetable
Seattle’s board gives a departure time for only about 59% of its flights, so many days show no gate time.
The last days
AA 3105 and AS 1757 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.