Originally Posted by
littl_flier
There is in fact a YUL-UVF service (though it's via MIA with a short stopover) and can be booked as a single flight.
You're right: YUL-MIA-UVF is a single flight number (AA2297), but only from Sep 3rd onwards. If that is only a seasonal flight, and may not exist next summer, that might affect OP's RTW if he is planning to fly that segment at the "wrong" time.
Happy Travels.