F9 3366 then AA 4040 at DFW
Denver → Dallas-Fort Worth → Brownsville
Timetable, Dallas-Fort Worth time
13:51F9 3366 from Denver at the gate
13:27AA 4040 to Brownsville leaves the gate
23 h 36 apart on the timetable, overnight
AA 4040 leaves 23 h 36 after F9 3366 arrives on the timetable: more than half a day, so not a connection we count.