AA 517 then UA 1593 at San Francisco
Chicago O'Hare → San Francisco → Houston
Timetable, San Francisco time
11:31AA 517 from Chicago O'Hare at the gatealso QF 4687
23:15UA 1593 to Houston leaves the gatealso EK 6028, NZ 9192
11 h 44 apart on the timetable
The last days
AA 517 and UA 1593 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.
Later flights to Houston
UA 50523:5912 h 28 after AA 517 on the timetable