WS 1542 then DL 2709 at Houston
Calgary → Houston → Atlanta
Timetable, Houston time
13:00WS 1542 from Calgary at the gate
08:05DL 2709 to Atlanta leaves the gate
19 h 05 apart on the timetable, overnight
DL 2709 leaves 19 h 05 after WS 1542 arrives on the timetable: more than half a day, so not a connection we count.