UA 3591 then 3S 445 at O'Hare
Pittsburgh → Chicago → Frankfurt am Main
Timetable, Chicago time
20:29UA 3591 from Pittsburgh at the gate
19:553S 445 to Frankfurt am Main leaves the gate
23 h 26 apart on the timetable, overnight
3S 445 leaves 23 h 26 after UA 3591 arrives on the timetable: more than half a day, so not a connection we count.