AA 866 then QF 7554 at O'Hare
Boston → Chicago → Dallas-Fort Worth
Timetable, Chicago time
15:37AA 866 from Boston at the gate
13:37QF 7554 to Dallas-Fort Worth leaves the gate
22 h apart on the timetable, overnight
QF 7554 leaves 22 h after AA 866 arrives on the timetable: more than half a day, so not a connection we count.