Canadian Affair has updated its booking engine with some of the changes - like the Gatwick/Ottawa flight becoming a TCX A330 running Gatwick/Ottawa/Toronto and the Gatwick/Montreal service becoming a TS A310. Where it has not yet removed the TCX 757s from the systems is presumably where it hasn't yet found a replacement aircraft to operate the flights in question. Monarch are definitely not doing any flying for Canadian Affair this summer now.