Booked my first AY15. This is a great service, as it allows connecting from Central Europe. The current AY5 schedule is too early for same-day connections from most of the Central European origins. AY16 is a little too late for my liking, with departure at 23:00, but again optimal for onward connections from Helsinki. So I ended up booking the AY15/AY6 combination. Also, the combination of A350 for the day flight and A330 for the night flight works just fine.