AS 306 then AS 727 at Seattle
Boston → Seattle → Atlanta
Timetable, Seattle time
21:59AS 306 from Boston at the gate
22:40AS 727 to Atlanta leaves the gate
41 min apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
AS 306 and AS 727 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.