DL 1287 then UA 2221 at Houston
Los Angeles → Houston → Miami
Timetable, Houston time
23:53DL 1287 from Los Angeles at the gate
08:00UA 2221 to Miami leaves the gate
8 h 07 apart on the timetable, overnight
The last days
DL 1287 and UA 2221 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.