DL 3913 then AA 757 at Seattle
Portland (Oregon) → Seattle → Dallas-Fort Worth
Timetable, Seattle time
20:50DL 3913 from Portland (Oregon) at the gate
15:41AA 757 to Dallas-Fort Worth leaves the gate
18 h 51 apart on the timetable, overnight
AA 757 leaves 18 h 51 after DL 3913 arrives on the timetable: more than half a day, so not a connection we count.