So I saw today that one of the days I was looking at going out to London this summer, BA is using a 747-400 for flight 294. It seemed like some of the days were a 747 and some were a 777. Right now it looks like November is all 777s. If BA is using the 747 for higher numbers of people going to Europe over the summer, is there a way to know what days of the week are 747 days and what days are 777 days? Or is it that there may not be any pre-set rotation?