AA 751 then MQ 3558 at Miami
Las Vegas → Miami → Des Moines
Timetable, Miami time
20:43AA 751 from Las Vegas at the gate
20:01MQ 3558 to Des Moines leaves the gate
23 h 18 apart on the timetable, overnight
MQ 3558 leaves 23 h 18 after AA 751 arrives on the timetable: more than half a day, so not a connection we count.