UA 3922 then AA 249 at O'Hare
Tampa → Chicago → Mexico City
Timetable, Chicago time
11:35UA 3922 from Tampa at the gate
08:45AA 249 to Mexico City leaves the gate
21 h 10 apart on the timetable, overnight
AA 249 leaves 21 h 10 after UA 3922 arrives on the timetable: more than half a day, so not a connection we count.