WN 4431 then VS 12 at Boston
St Louis → Boston → London
Timetable, Boston time
23:25WN 4431 from St Louis at the gate
22:11VS 12 to London leaves the gate
22 h 46 apart on the timetable, overnight
VS 12 leaves 22 h 46 after WN 4431 arrives on the timetable: more than half a day, so not a connection we count.