AA 1866 then DL 1269 at Philadelphia
Denver → Philadelphia → Atlanta
Timetable, Philadelphia time
05:35AA 1866 from Denver at the gate
05:15DL 1269 to Atlanta leaves the gate
23 h 40 apart on the timetable, overnight
DL 1269 leaves 23 h 40 after AA 1866 arrives on the timetable: more than half a day, so not a connection we count.