UA 2842 then AA 1408 at DFW
San Francisco → Dallas-Fort Worth → Huatulco
Timetable, Dallas-Fort Worth time
15:49UA 2842 from San Francisco at the gate
10:23AA 1408 to Huatulco leaves the gate
18 h 34 apart on the timetable, overnight
AA 1408 leaves 18 h 34 after UA 2842 arrives on the timetable: more than half a day, so not a connection we count.