AA 1920 then AS 594 at Seattle
Charlotte → Seattle → Ontario
Timetable, Seattle time
12:18AA 1920 from Charlotte at the gate
15:41AS 594 to Ontario leaves the gate
3 h 23 apart on the timetable
Seattle’s board gives a departure time for only about 57% of its flights, so many days show no gate time.
The last days
AA 1920 and AS 594 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.