AA 3740 then 7L 9790 at O'Hare
Sioux Falls → Chicago → Houston
Timetable, Chicago time
09:00AA 3740 from Sioux Falls at the gate
12:207L 9790 to Houston leaves the gate
3 h 20 apart on the timetable
The last days
AA 3740 and 7L 9790 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.