UA 2787 then AA 5347 at Philadelphia
Denver → Philadelphia → Richmond
Timetable, Philadelphia time
19:31UA 2787 from Denver at the gate
10:02AA 5347 to Richmond leaves the gate
14 h 31 apart on the timetable, overnight
AA 5347 leaves 14 h 31 after UA 2787 arrives on the timetable: more than half a day, so not a connection we count.