AA 9977 then WN 1270 at Philadelphia
Cleveland → Philadelphia → Denver
Timetable, Philadelphia time
23:17AA 9977 from Cleveland at the gate
17:15WN 1270 to Denver leaves the gate
17 h 58 apart on the timetable, overnight
WN 1270 leaves 17 h 58 after AA 9977 arrives on the timetable: more than half a day, so not a connection we count.