The B767 was planned for most of April, approximately 4 days a week.
April is the last month of higher winter demand, the service then drops to 5 weekly next month.
Winter to KEF has gone crazy, to think Easyjet offer 9 weekly (and most flights going full), Icelandair daily with some B753 and B763 usage, as well as 2 weekly TUI and now next winter seeing ad hoc charters to Auekeri, I was sceptical the market could support that capacity but each carrier appears to be holding its own.