AA 873 then UA 8179 at O'Hare
Atlanta → Chicago → Newark
Timetable, Chicago time
12:29AA 873 from Atlanta at the gate
13:07UA 8179 to Newark leaves the gate
38 min apart on the timetable
The last days
AA 873 and UA 8179 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.