AA 750 then AA 1953 at Miami
Lexington → Miami → St Louis
Timetable, Miami time
13:47AA 750 from Lexington at the gate
13:42AA 1953 to St Louis leaves the gate
23 h 55 apart on the timetable, overnight
AA 1953 leaves 23 h 55 after AA 750 arrives on the timetable: more than half a day, so not a connection we count.