UA 1087 then DL 3876 at Denver
San José (Costa Rica) → Denver → Austin
Timetable, Denver time
12:15UA 1087 from San José (Costa Rica) at the gate
09:42DL 3876 to Austin leaves the gate
21 h 27 apart on the timetable, overnight
DL 3876 leaves 21 h 27 after UA 1087 arrives on the timetable: more than half a day, so not a connection we count.