AA 509 then MQ 4354 at Miami
Houston → Miami → Cincinnati
Timetable, Miami time
09:45AA 509 from Houston at the gate
14:29MQ 4354 to Cincinnati leaves the gate
4 h 44 apart on the timetable
The last days
AA 509 and MQ 4354 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.