That probably explains why my flight from YEG to YYZ tonight shows as [back to] a A320 rather than the E90 that had been operating this flight for most of the winter. Will be interesting to see what it turns out to be in reality, and if it is an A320, if it will be an XM. I've found lots of aircraft changes on day-of-flight, including as I've noted before E90s for E75s, CRJs for DASH8s and A320s for A319s (likely due to larger loads on some routes).