Y4 800 then AA 1254 at DFW
Mexico City → Dallas-Fort Worth → Nashville
Timetable, Dallas-Fort Worth time
09:44Y4 800 from Mexico City at the gate
07:30AA 1254 to Nashville leaves the gate
21 h 46 apart on the timetable, overnight
AA 1254 leaves 21 h 46 after Y4 800 arrives on the timetable: more than half a day, so not a connection we count.