AS 407 then ET 3511 at O'Hare
Seattle (SEA) → Chicago → Muscat
Timetable, Chicago time
15:00AS 407 from Seattle (SEA) at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 05 apart on the timetable, overnight
ET 3511 leaves 18 h 05 after AS 407 arrives on the timetable: more than half a day, so not a connection we count.