AA 1920 then AA 1809 at Charlotte
Ontario → Charlotte → Boston
Timetable, Charlotte time
06:02AA 1920 from Ontario at the gate
10:07AA 1809 to Boston leaves the gate
4 h 05 apart on the timetable
The last days
AA 1920 and AA 1809 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.