UA 604 then YV 4077 at Philadelphia
Houston → Philadelphia → Washington
Timetable, Philadelphia time
11:37UA 604 from Houston at the gate
10:30YV 4077 to Washington leaves the gate
22 h 53 apart on the timetable, overnight
YV 4077 leaves 22 h 53 after UA 604 arrives on the timetable: more than half a day, so not a connection we count.