UA 3851 then AA 810 at San Francisco
Rio De Janeiro → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
17:41UA 3851 from Rio De Janeiro at the gate
13:57AA 810 to Dallas-Fort Worth leaves the gatealso QF 3064, BA 5598, RJ 7016
20 h 16 apart on the timetable, overnight
AA 810 leaves 20 h 16 after UA 3851 arrives on the timetable: more than half a day, so not a connection we count.