AA 1985 then AA 1901 at Charlotte
Des Moines → Charlotte → Boston
Timetable, Charlotte time
10:30AA 1985 from Des Moines at the gate
15:16AA 1901 to Boston leaves the gate
4 h 46 apart on the timetable
The last days
AA 1985 and AA 1901 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.