AS 315 then DL 1543 at Detroit
Seattle → Detroit → Dallas-Fort Worth
Timetable, Detroit time
05:40AS 315 from Seattle at the gate
15:50DL 1543 to Dallas-Fort Worth leaves the gate
10 h 10 apart on the timetable
The last days
AS 315 and DL 1543 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.