OO 225 then AA 2537 at O'Hare
Richmond → Chicago → Tucson
Timetable, Chicago time
11:48OO 225 from Richmond at the gate
11:45AA 2537 to Tucson leaves the gate
23 h 57 apart on the timetable, overnight
AA 2537 leaves 23 h 57 after OO 225 arrives on the timetable: more than half a day, so not a connection we count.