WS 1542 then SY 8405 at Houston
Calgary → Houston → Atlanta
Timetable, Houston time
13:00WS 1542 from Calgary at the gate
18:30SY 8405 to Atlanta leaves the gate
5 h 30 apart on the timetable
The last days
WS 1542 and SY 8405 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.