UA 1606 then PD 2346 at Boston
Chicago O'Hare → Boston → Ottawa
Timetable, Boston time
13:59UA 1606 from Chicago O'Hare at the gate
13:15PD 2346 to Ottawa leaves the gate
23 h 16 apart on the timetable, overnight
PD 2346 leaves 23 h 16 after UA 1606 arrives on the timetable: more than half a day, so not a connection we count.