AA 2103 then AA 2306 at DFW
St Louis → Dallas-Fort Worth → Boston
Timetable, Dallas-Fort Worth time
10:38AA 2103 from St Louis at the gate
14:36AA 2306 to Boston leaves the gate
3 h 58 apart on the timetable
The last days
AA 2103 and AA 2306 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.