This is a first, GSM are using an Air Comet A310 inbound from YVR to MAN ( according to reports).
Tommy Cook operates a DAILY service from MAN to Pearson (YYZ) & multiple departures on A330 to YVR & YYC, Monarch also do the odd Calgary,so no, GSM & Transat are not the only operators from MAN to Canada by a long way.