The YEG-YYZ flight changed from a 00:30 (if I remember correctly) departure to the current 00:15 departure sometime near the end of April. I took the YEG-YYZ (arr. 05:51) yesterday. The plane boarded quite quickly and the pilot announced that we wouldn't be pushing back for 5-10 more minutes due to the arrival curfew in YYZ. We pushed back about 5 min early (after waiting about 10 minutes as the pilot said we would) and were on the YYZ runway by about 05:45.