TU 744 then UA 181 at Frankfurt
Tunis → Frankfurt am Main → Denver
Timetable, Frankfurt am Main time
17:25TU 744 from Tunis at the gate
11:10UA 181 to Denver leaves the gate
17 h 45 apart on the timetable, overnight
UA 181 leaves 17 h 45 after TU 744 arrives on the timetable: more than half a day, so not a connection we count.