AA 1998 then UA 1750 at Phoenix
Seattle → Phoenix → Chicago O'Hare
Timetable, Phoenix time
10:24AA 1998 from Seattle at the gate
14:37UA 1750 to Chicago O'Hare leaves the gate
4 h 13 apart on the timetable
The last days
AA 1998 and UA 1750 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.