AA 4523 then UA 1910 at O'Hare
Baltimore → Chicago → Newark
Timetable, Chicago time
20:00AA 4523 from Baltimore at the gate
21:00UA 1910 to Newark leaves the gate
1 h apart on the timetable
The last days
AA 4523 and UA 1910 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.