AA 1206 then AA 3663 at DFW
Boston → Dallas-Fort Worth → St Louis
Timetable, Dallas-Fort Worth time
16:16AA 1206 from Boston at the gate
20:25AA 3663 to St Louis leaves the gate
4 h 09 apart on the timetable
The last days
AA 1206 and AA 3663 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.