PD 154 then UA 3903 at Toronto Pearson
Ottawa → Toronto → Houston
Timetable, Toronto time
11:27PD 154 from Ottawa at the gate
11:00UA 3903 to Houston leaves the gate
23 h 33 apart on the timetable, overnight
UA 3903 leaves 23 h 33 after PD 154 arrives on the timetable: more than half a day, so not a connection we count.