AA 509 then AA 2172 at Miami
Houston → Miami → New York LaGuardia
Timetable, Miami time
09:45AA 509 from Houston at the gate
16:27AA 2172 to New York LaGuardia leaves the gate
6 h 42 apart on the timetable
The last days
AA 509 and AA 2172 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.