F9 2072 then AA 2878 at Philadelphia
Raleigh-Durham → Philadelphia → Denver
Timetable, Philadelphia time
16:24F9 2072 from Raleigh-Durham at the gate
16:00AA 2878 to Denver leaves the gate
23 h 36 apart on the timetable, overnight
AA 2878 leaves 23 h 36 after F9 2072 arrives on the timetable: more than half a day, so not a connection we count.