AA 9911 then LH 431 at O'Hare
Des Moines → Chicago → Frankfurt am Main
Timetable, Chicago time
19:30AA 9911 from Des Moines at the gate
16:20LH 431 to Frankfurt am Main leaves the gate
20 h 50 apart on the timetable, overnight
LH 431 leaves 20 h 50 after AA 9911 arrives on the timetable: more than half a day, so not a connection we count.