AA 397 then F9 1342 at DFW
Boston → Dallas-Fort Worth → Chicago O'Hare
Timetable, Dallas-Fort Worth time
10:38AA 397 from Boston at the gate
06:55F9 1342 to Chicago O'Hare leaves the gate
20 h 17 apart on the timetable, overnight
F9 1342 leaves 20 h 17 after AA 397 arrives on the timetable: more than half a day, so not a connection we count.