UA 3920 then AA 538 at O'Hare
Fort Lauderdale → Chicago → Des Moines
Timetable, Chicago time
01:29UA 3920 from Fort Lauderdale at the gate
10:50AA 538 to Des Moines leaves the gate
9 h 21 apart on the timetable
The last days
UA 3920 and AA 538 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.