UA 844 then CV 251 at O'Hare
São Paulo → Chicago → Dallas-Fort Worth
Timetable, Chicago time
05:15UA 844 from São Paulo at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
16 h 55 apart on the timetable
CV 251 leaves 16 h 55 after UA 844 arrives on the timetable: more than half a day, so not a connection we count.