AA 454 then DL 1692 at Philadelphia
Austin → Philadelphia → Atlanta
Timetable, Philadelphia time
17:17AA 454 from Austin at the gate
17:16DL 1692 to Atlanta leaves the gate
23 h 59 apart on the timetable, overnight
DL 1692 leaves 23 h 59 after AA 454 arrives on the timetable: more than half a day, so not a connection we count.