WN 2091 then UA 1732 at Boston
Baltimore → Boston → Chicago O'Hare
Timetable, Boston time
00:10WN 2091 from Baltimore at the gate
12:14UA 1732 to Chicago O'Hare leaves the gate
12 h 04 apart on the timetable
UA 1732 leaves 12 h 04 after WN 2091 arrives on the timetable: more than half a day, so not a connection we count.