UA 3884 then AA 4548 at O'Hare
Melbourne (Florida) → Chicago → Des Moines
Timetable, Chicago time
01:06UA 3884 from Melbourne (Florida) at the gate
22:53AA 4548 to Des Moines leaves the gate
21 h 47 apart on the timetable
AA 4548 leaves 21 h 47 after UA 3884 arrives on the timetable: more than half a day, so not a connection we count.