UA 6047 then UA 2813 at O'Hare
Pittsburgh → Chicago → Houston
Timetable, Chicago time
20:31UA 6047 from Pittsburgh at the gate
19:55UA 2813 to Houston leaves the gate
23 h 24 apart on the timetable, overnight
UA 2813 leaves 23 h 24 after UA 6047 arrives on the timetable: more than half a day, so not a connection we count.