DL 873 then AA 1573 at DFW
New York LaGuardia → Dallas-Fort Worth → Chicago O'Hare
Timetable, Dallas-Fort Worth time
20:23DL 873 from New York LaGuardia at the gate
17:54AA 1573 to Chicago O'Hare leaves the gate
21 h 31 apart on the timetable, overnight
AA 1573 leaves 21 h 31 after DL 873 arrives on the timetable: more than half a day, so not a connection we count.