AA 4185 then AA 3107 at O'Hare
Marquette → Chicago → Boston
Timetable, Chicago time
17:27AA 4185 from Marquette at the gate
19:03AA 3107 to Boston leaves the gate
1 h 36 apart on the timetable
The last days
AA 4185 and AA 3107 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.