HWAU:
I was originally booked on the 6am flight this morning (booked in mid December) but it was cancelled the week before Christmas. I asked KLM why and they said it was for "operational reasons". Note that the 9:35 inbound last night was also cancelled at the same time.
Looks like a one off as I checked all the weekday flights between now and the end of February and they are all 3 flights a day.