TU 744 then UA 906 at Frankfurt
Tunis → Frankfurt am Main → Chicago
Timetable, Frankfurt am Main time
17:25TU 744 from Tunis at the gate
12:55UA 906 to Chicago leaves the gate
19 h 30 apart on the timetable, overnight
UA 906 leaves 19 h 30 after TU 744 arrives on the timetable: more than half a day, so not a connection we count.