DL 506 then AA 2230 at Miami
Seattle → Miami → Houston
Timetable, Miami time
17:06DL 506 from Seattle at the gate
14:09AA 2230 to Houston leaves the gate
21 h 03 apart on the timetable, overnight
AA 2230 leaves 21 h 03 after DL 506 arrives on the timetable: more than half a day, so not a connection we count.