UA 3909 then CM 409 at San Francisco
Chicago O'Hare → San Francisco → Tocumen
Timetable, San Francisco time
22:20UA 3909 from Chicago O'Hare at the gate
19:36CM 409 to Tocumen leaves the gate
21 h 16 apart on the timetable, overnight
CM 409 leaves 21 h 16 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.